MAIN CONTROL VALVE

H3.50-5.50XM (H70-120XM) [K005, L005];

S3.50-5.50XM (S70-120XM) [E004, F004]

PART NO. 1466211

2000 SRM 754

SAFETY PRECAUTIONS

MAINTENANCE AND REPAIR

• When lifting parts or assemblies, make sure all slings, chains, or cables are correctly

fastened, and that the load being lifted is balanced. Make sure the crane, cables, and
chains have the capacity to support the weight of the load.

• Do not lift heavy parts by hand, use a lifting mechanism.

• Wear safety glasses.

• DISCONNECT THE BATTERY CONNECTOR before doing any maintenance or repair

on electric lift trucks. Disconnect the battery ground cable on internal combustion lift
trucks.

• Always use correct blocks to prevent the unit from rolling or falling. See HOW TO PUT

THE LIFT TRUCK ON BLOCKS in the Operating Manual or the Periodic Mainte-
nance section.

• Keep the unit clean and the working area clean and orderly.

• Use the correct tools for the job.

• Keep the tools clean and in good condition.

• Always use HYSTER APPROVED parts when making repairs. Replacement parts

must meet or exceed the specifications of the original equipment manufacturer.

• Make sure all nuts, bolts, snap rings, and other fastening devices are removed before

using force to remove parts.

• Always fasten a DO NOT OPERATE tag to the controls of the unit when making repairs,

or if the unit needs repairs.

• Be sure to follow the WARNING and CAUTION notes in the instructions.

• Gasoline, Liquid Petroleum Gas (LPG), Compressed Natural Gas (CNG), and Diesel fuel

are flammable. Be sure to follow the necessary safety precautions when handling these
fuels and when working on these fuel systems.

• Batteries generate flammable gas when they are being charged. Keep fire and sparks

away from the area. Make sure the area is well ventilated.

NOTE:

The following symbols and words indicate safety information in this

manual:

WARNING

Indicates a condition that can cause immediate death or injury!

CAUTION

Indicates a condition that can cause property damage!

Main Control Valve

Table of Contents

TABLE OF CONTENTS

General ...............................................................................................................................................................

Description .........................................................................................................................................................

Operation............................................................................................................................................................

Lift Section .....................................................................................................................................................

Tilt and Auxiliary Sections ...........................................................................................................................

Reattaching the Clevis End of the Tilt Spool...........................................................................................

Relief Valve ....................................................................................................................................................

Main Control Valve Repair ................................................................................................................................

Remove and Disassemble ..............................................................................................................................

Clean and Inspect ..........................................................................................................................................

Assemble ........................................................................................................................................................

Install .............................................................................................................................................................

Pressure Relief Valve Check and Adjustment..................................................................................................

Main Relief Valve (Lift) .................................................................................................................................

Steering Relief Valve .....................................................................................................................................

Secondary Relief Valve (Tilt and Auxiliary) .................................................................................................

Specifications......................................................................................................................................................

Troubleshooting..................................................................................................................................................

This section is for the following models:

H3.50-5.50XM (H70-120XM) [K005, L005];

S3.50-5.50XM (S70-120XM) [E004, F004]

"THE

QUALITY

KEEPERS"

HYSTER

APPROVED

PARTS

2000 SRM 754

Operation

General

This section contains a description and repair procedures for the main control valve used in the hydraulic
system.

Description

The main control valve controls the operation of the
steering, lift, tilt, and auxiliary cylinders. The main
control valve is fastened to a bracket located on the
right side of the lift truck.

The main control valve assembly is divided into the
following sections:
• Inlet section
• Steering control section
• Lift and lower section
• Tilt section
• Auxiliary section

Additional auxiliary sections can be added to the
main control valve to control optional auxiliary func-
tions.

The end section and any additional optional auxil-
iary sections are attached to the control valve with 3
through bolts.

Each spool has a spring that returns the spool to
the NEUTRAL position when the control lever is re-
leased.

The main control valve contains three pressure relief
valves. One for the steering section, one for the lift
section, and one for the tilt and auxiliary sections.
The steering and lift relief valves are installed in the
inlet section while the tilt and auxiliary relief valve
is installed in the main body between the tilt and
auxiliary spools. The pressure relief valves limit the
maximum pressure within the hydraulic system.

The inlet section also contains a valve that provides
a steady 17 liter/min (4.5 gal/min) hydraulic flow out
of the main control valve to the steering valve. This
flow then returns to the hydraulic tank through the
end section. See Figure 1, Figure 2, and Figure 3.

Operation

The main control valve is an open center, series-par-
allel circuit valve. See Figure 4. When open center
valve spools are in the NEUTRAL position, the hy-
draulic oil flows through the valve with minimum re-
striction. The oil passes through the valve and re-
turns to the hydraulic tank through the end section.

The inlet section of the valve also includes the steer-
ing flow divider. The steering flow divider is a pri-
ority valve that provides a steady supply to steering
regardless of the downstream loads from lift, tilt, or
auxiliary functions. Excess flow from the flow divider
is routed to the lift, tilt, and auxiliary functions. The
lift, tilt, and auxiliary functions of the main control
valve are configured as an open center, series-paral-
lel circuit valve.

LIFT SECTION

The lift function is configured as a series circuit. As
the spool is shifted to the lift mode, the lift spool
makes a restriction in the open center passage. In-
creased pressure in the series passage causes oil to
flow through the check valve to the supply cavity.
The check valve prevents the movement of the load
until the system pressure is great enough to control
the load. When the lift spool is fully shifted in the lift
mode, oil supply is blocked through the open center
passage to the tilt and auxiliary function, forcing all
flow to the lift circuit. When the spool is in the lower
position, the spool opens a path from the lift cylinder
to the drain cavity. The spool is made so that the oil
flow through the open center passage is not stopped.

Operation

2000 SRM 754

MAIN CONTROL VALVE BODY

STEERING OUT (TO STEERING CONTROL
VALVE)

INLET

LIFT SECTION HYDRAULIC CONNECTION

TILT SECTION HYDRAULIC CONNECTION

STEERING RELIEF VALVE

AUXILIARY SECTION HYDRAULIC
CONNECTION

TILT AND AUXILIARY RELIEF VALVE

OPTIONAL AUXILIARY SECTION

10. END SECTION
11. STEERING CONTROL VALVE RETURN
12. RETURN TO HYDRAULIC TANK

13. AUXILIARY SECTION SPOOL
14. PARALLEL PASSAGE
15. OPEN CENTER PASSAGE
16. AUXILIARY SECTION, END CAP
17. TILT SECTION, END CAP
18. LIFT SECTION, END CAP
19. O-RING (2 PLACES)
20. PLASTIC SEAL (2 PLACES)
21. SPRING RETAINING SCREW
22. SPRING RETAINER
23. WASHER
24. SPRING
25. SEAL RETAINER

Figure 1. Main Control Valve, Older Model H3.50-5.50XM (H70-120XM) [K005] Lift Trucks

2000 SRM 754

Operation

MAIN CONTROL VALVE BODY

FITTINGS

STEERING RELIEF VALVE

LIFT RELIEF VALVE

LIFT SECTION HYDRAULIC
CONNECTION

O-RING

WIPER SEAL

SEAL RETAINER

CAPSCREW

10. NUT
11. TILT AND AUXILIARY RELIEF

VALVE

12. AUXILIARY SPOOLS
13. SPRING RETAINER
14. SPRING
15. CAP
16. TILT SPOOL
17. LIFT SPOOL
18. PARALLEL PASSAGE

19. OPEN CENTER PASSAGE
20. OUTLET SECTION
21. SPRING RETAINER SCREW
22. OPTIONAL AUXILIARY

SECTION(S)

23. TILT SECTION
24. RETURN TO HYDRAULIC

TANK

25. STEERING OUT (TO

STEERING CONTROL VALVE)

Figure 2. Main Control Valve, Newer Model H3.50-5.50XM (H70-120XM) [K005] Lift Trucks, and

H3.50-5.50XM (H70-120XM) [L005], and S3.50-5.50XM (S70-120XM) [F004] Lift Trucks

Operation

2000 SRM 754

Figure 3. Main Control Valve S3.50-5.50XM (S70-120XM) [E004] Model Trucks

2000 SRM 754

Operation

Legend for Figure 3

MAIN RELIEF VALVE

STEERING RELIEF VALVE

MAIN CONTROL VALVE BODY

LIFT RELIEF VALVE

TILT RELIEF VALVE

O-RING

AUXILIARY RELIEF VALVE

WIPER SEAL

SPRING RETAINER PLATE

10. SPRING
11. BOLT
12. LOCKWASHER AND CAPSCREW

13. END SECTION
14. STEERING CONTROL VALVE RETURN
15. PLUG
16. THROUGH-BOLTS
17. RETURN TO HYDRAULIC TANK
18. OPTIONAL AUXILIARY VALVE SECTIONS
19. BACKUP RING
20. SECONDARY RELIEF VALVE
21. STEERING PRESSURE TEST PORT
22. INLET PORT
23. STEERING OUTLET PORT (TO STEERING

CONTROL VALVE)

MAIN CONTROL VALVE

17 liter/min (4.5 gal/min) TO STEERING
CONTROL VALVE

FLOW FROM HYDRAULIC PUMP

STEERING RELIEF VALVE

LIFT RELIEF VALVE

LIFT/LOWER SPOOL

TILT SPOOL

TILT AND AUXILIARY RELIEF VALVE

AUXILIARY SPOOL

10. FROM STEERING CONTROL VALVE
11. HYDRAULIC TANK

Figure 4. Control Valve Schematic

TILT AND AUXILIARY SECTIONS

The tilt and auxiliary functions are configured as
parallel circuits. Each spool can operate without pre-
venting the flow of oil to another spool. The parallel
circuit also allows a single relief valve to control the
maximum pressure of all functions in the circuit.

The operation of these spools is similar to that of the
lift spool. As the spool is shifted from the NEUTRAL
position, the flow through the open center passage is

restricted, increasing the system pressure. The in-
creased pressure in the series passage causes the oil
to flow through the check valve to the supply cavity.
The check valve prevents the movement of the load
until the system pressure is great enough to control
the load. When the spool is fully shifted, the paral-
lel flow path allows flow of oil to the other functions
in the parallel circuit. Flow from the tilt cylinders
or auxiliary attachments returns through the main
control valve to the hydraulic tank.

Main Control Valve Repair

2000 SRM 754

When tilting forward, an additional tilt control spool,
located inside the tilt spool, is used to prevent cavi-
tation in the piston end of the tilt cylinders. Cav-
itation occurs when the available fluid does not fill
the space in a closed system. When cavitation oc-
curs in the tilt cylinders, the tilt forward function is
not smooth. The tilt control spool permits the reg-
ulation of the tilt speed by using the pressure from
the hydraulic pump. The pump pressure must be at
least 800 kPa (116 psi) on the piston ends of the tilt
cylinders. The tilt control spool prevents oil flow from
the rod end of the tilt cylinder until the pressure is
800 kPa (116 psi). This action makes sure that a vac-
uum cannot occur at the piston ends of the tilt cylin-
ders.

Reattaching the Clevis End of the Tilt
Spool

The clevis end of the tilt spool screws off to enable
assembly of the tilt control spool and spring inside
the tilt spool. If this clevis end becomes loose or dis-
engages, then a hydraulic oil leak can occur. Follow
these procedures to reattach the clevis end.

Remove the tilt spool assembly from the valve
body.

Remove original O-Ring above threads on clevis
end and replace with new O-Ring.

Clean threads of clevis end and apply one drop of
Loctite 515.

Turn clevis end into tilt spool and tighten to
16 N•m (12 lbf ft).

Install tilt spool assembly into valve body.

RELIEF VALVE

The relief valve limits the maximum pressure within
the hydraulic system. The control valve has three
relief valves. The steering relief valve and the lift
relief valve are installed in the inlet section of the
control valve. The third relief valve is for the tilt
and auxiliary circuits and is installed in the section
of the control valve with the tilt and auxiliary spools.
All the relief valves are the same in description and
operation. The tilt and auxiliary relief valve is set
at a lower pressure than the lift relief valve. When
the pressure in one of the hydraulic circuits reaches
the relief valve setting, the relief valve opens a path
between the inlet and drain circuits.

Main Control Valve Repair

REMOVE AND DISASSEMBLE

WARNING

Lower the mast before disconnecting lines
from the control valve to prevent the mast
from lowering suddenly.

NOTE:

For H3.50-5.50XM (H70-120XM) (K005,

L005) lift trucks, perform Step 1 and Step 2
and Step 6 through Step 12.

For S3.50-5.50XM

(S70-120XM) (E004, F004) lift trucks, perform Steps
Step 3 through Step 12.

Remove linkage cover. See Figure 5 and Figure 6.

Disconnect linkage at spools and remove lever
assembly from main control valve. See Figure 5
or Figure 6.

Remove boot first before removing cover. Grab
lip portion of boot that fits over hole in cover and
pull forward to release boot from boot retainer.
Remove boot from control levers. See Figure 7.

Remove four spring washers and nuts that hold
cover on its mounting bracket. Remove boot re-
tainer (two pieces) and two springs that are in
the tube part of the boot retainer. See Figure 7.

Disconnect linkage at spools. Disconnect control
lever assembly (linkage) by removing two cap-
screws from right hand bracket. Remove pivot
shaft from control lever assembly. Remove con-
trol lever assembly from control valve. See Fig-
ure 7.

2000 SRM 754

Main Control Valve Repair

LINKAGE COVER

LEVER ASSEMBLY

MAIN CONTROL
VALVE

Figure 5. Linkage Removal, Older Model

H3.50-5.50XM (H70-120XM) [K005] Lift Trucks

Disconnect hydraulic lines at control valve. Put
caps on open lines and install plugs in open ports
of control valve. See Figure 8 and Figure 9.

Remove bolts that hold main control valve to con-
trol valve mounting bracket. See Figure 8, Fig-
ure 9, Figure 10, and Figure 11.

NOTE:

Disassemble main control valve as necessary

for repairs. Most repairs require adjustments to the
linkage and the replacement of O-rings to stop leaks.
Passages in the tilt spool are small and can need
cleaning if hydraulic oil becomes dirty. If the spool or
valve section is damaged, replace main control valve.

Remove end cap from valve section. Carefully
pull spool from valve section.

Do not remove

spring retainers unless a spring must be re-
placed. See Figure 1, Figure 2, and Figure 3.

To remove the optional auxiliary valve sections
from the main control valve body, remove three
through-bolts.

10. Remove control spools by removing end caps and

pulling spool out of control valve.

11. Remove spring retaining screw from end of spool

to separate spring parts.

12. Inspect spring and spring retainers, replace

damaged parts.

LINKAGE COVER

LEVER ASSEMBLY

MAIN CONTROL
VALVE

Figure 6. Linkage Removal, Newer Model

H3.50-5.50XM (H70-120XM) [K005] Lift Trucks

and H3.50-5.50XM (H70-120XM) [L005] Lift

Trucks

Main Control Valve Repair

2000 SRM 754

BOOT COVER

BOOT RETAINER

BOOT SPRINGS

CONTROL VALVE COVER ATTACHMENT
CAPSCREW, NUT, AND SPRING

CONTROL LEVER COVER

CONTROL LEVERS

CONTROL VALVE COVER MOUNTING
BRACKET

CAPSCREWS

MAIN CONTROL VALVE

10. CONTROL VALVE MOUNTING BRACKET
11. PIVOT SHAFT

Figure 7. Linkage Removal S3.50-5.50XM

(S70-120XM) [E004, F004] Model Lift Trucks

Figure 8. Control Valve Removal, Older Model

H3.50-5.50XM (H70-120XM) [K005] Lift Truck

Models

CLEAN AND INSPECT

WARNING

Cleaning solvents can be flammable and toxic
and can cause skin irritation.

When using

cleaning solvents, always follow the solvent
manufacturer’s recommended safety precau-
tions.

WARNING

Compressed air can move particles so they
cause injury to the user or to other personnel.
Make sure the path of the compressed air is
away from all personnel. Wear protective gog-
gles or a face shield to prevent injury to the
eyes.

2000 SRM 754

Main Control Valve Repair

Clean all parts of control valve with solvent. Dry
parts with compressed air.

Inspect spools and bores for defects. If spool or
bores have damage, replace control valve section.

Coat spools with clean hydraulic fluid and make
sure spools move freely in bores.

Inspect relief valve for damage. If relief valve is
damaged, it must be replaced.

Figure 9. Control Valve Removal, Newer Model

H3.50-5.50XM (H70-120XM) [K005] Lift Trucks

and H3.50-5.50XM (H70-120XM) [L005] Lift

Truck Models

Figure 10. Control Valve Removal S3.50-5.50XM

(S70-120XM) (E004) Lift Truck Models

Figure 11. Control Valve Removal S3.50-5.50XM

(S70-120XM) (F004) Lift Truck Models

Main Control Valve Repair

2000 SRM 754

ASSEMBLE

CAUTION

Before installing the parts into the valve body,
make sure all parts are clean. Replace all the
seals and the O-rings. Lubricate all parts with
clean hydraulic oil during assembly.

Install new seals in bores of control valve. In-
stall new O-ring seals between control valve and
optional auxiliary section if installed, or end sec-
tion if the optional auxiliary section is not in-
stalled. Tighten 14 mm through bolts to 115 N•m
(85 lbf ft).

If return springs were removed from control
spools, install spring retainers. During assem-
bly, use new O-rings for the parts of the tilt
control spool.

Do not damage O-rings during

installation.

Lubricate spools with clean hydraulic oil. Make
sure dirt does not get on any parts. Carefully
install spools in valve body. Install seal retainers
and covers for return springs.

Install relief valves.

INSTALL

Install control valve to mounting bracket. See
Figure 8, Figure 9, Figure 10, and Figure 11.

Install linkage (control lever) assembly to control
valve. See Figure 5, Figure 6, and Figure 7.

Connect linkage at spools.

Connect hydraulic lines to control valve.

NOTE: For H3.50-5.50XM (H70-120XM) (K005,
L005) lift trucks, proceed to Step 8.

For S3.50-

5.50XM (S70-120XM) (E004, F004) lift trucks per-
form Step 5 through Step 9.

Install control lever cover to mounting bracket.
See Figure 12.

Install boot springs in tube portion of boot re-
tainer and connect boot retainer around control
levers, just above hole in cover. Set boot retainer
on edge of cover hole. Slide boot over control
levers. See Figure 12.

Place lip of boot around edges of boot retainer.
Push boot retainer under cover hole so it is under

cover and boot lip is flush along edges of cover
hole. See Figure 12.

Add hydraulic oil to tank. See section Periodic
Maintenance for correct specifications.

Operate system and check for leaks and correct
operation.

BOOT COVER

BOOT RETAINER

BOOT SPRINGS

CONTROL VALVE COVER ATTACHMENT
CAPSCREW, NUT, AND SPRING

CONTROL LEVER COVER

CONTROL LEVERS

CONTROL VALVE COVER MOUNTING
BRACKET

CAPSCREWS

MAIN CONTROL VALVE

10. CONTROL VALVE MOUNTING BRACKET
11. PIVOT SHAFT

Figure 12. Cover and Boot Installation

S3.50-5.50XM (S70-120XM) Models

2000 SRM 754

Pressure Relief Valve Check and Adjustment

The control valve has three relief valves. The steer-
ing relief valve and the lift relief valve are installed
in the inlet section of the control valve. The third re-
lief valve is for the tilt and auxiliary circuits and is
installed in the section of the control valve with the
tilt and auxiliary spools.

MAIN RELIEF VALVE (LIFT)

To check the pressure of the main pressure relief
valve, do the following:

Connect a 0 to 25 MPa (0 to 3500 psi) gauge to
test port on side of main control valve.

Start engine and operate hydraulic system to
warm oil temperature to 55 to 65 C (130 to
150 F). Run engine at approximately 1000 rpm
when making pressure checks.

Check relief valve by raising mast until it stops.
Hold lever and check reading of gauge when re-
lief valve opens. If pressure is not correct, replace
relief valve. See the Specifications section for the
correct pressure.

Remove gauge when checks are complete.

STEERING RELIEF VALVE

To check the pressure of the steering pressure relief
valve, do the following:

Remove floor plates to access steering hydraulic
lines. See Figure 13, Figure 14, Figure 15, and
Figure 16.

Connect a 0 to 20 MPa (0 to 2000 psi) gauge to
test port. See Figure 13, Figure 14, Figure 15,
and Figure 16.

STEERING CONTROL VALVE

MAIN CONTROL VALVE

STEERING TEST PORT

Figure 13. Steering System Hydraulic Lines, Older Model H3.50-5.50XM (H70-120XM) [K005] Lift

Trucks

Pressure Relief Valve Check and Adjustment

2000 SRM 754

STEERING CONTROL VALVE

MAIN CONTROL VALVE

STEERING TEST PORT

Figure 14. Steering System Hydraulic Lines, Newer Model H3.50-5.50XM (H70-120XM) [K005] Lift

Trucks and H3.50-5.50XM (H70-120XM) [L005] Lift Trucks

2000 SRM 754

Pressure Relief Valve Check and Adjustment

STEERING CONTROL VALVE

MAIN CONTROL VALVE

STEERING TEST PORT

Figure 15. Steering System Hydraulic Lines S3.50-5.50XM (S70-120XM) [E004] Model Trucks

Pressure Relief Valve Check and Adjustment

2000 SRM 754

STEERING CONTROL VALVE

MAIN CONTROL VALVE

STEERING TEST PORT

Figure 16. Steering System Hydraulic Lines S3.50-5.50XM (S70-120XM) [F004] Model Trucks

Start engine and operate hydraulic system to
warm oil temperature to 55 to 65 C (130 to
150 F). Run engine at approximately 1000 rpm
when making pressure checks.

Check secondary relief valve by turning steer-
ing wheel to the right until it stops. Hold wheel
in place and check reading of gauge when relief
valve opens. If pressure is not correct, replace re-
lief valve. See the Specifications section for the
correct pressure.

Remove gauge and install floor plates when
checks are completed.

SECONDARY RELIEF VALVE (TILT AND
AUXILIARY)

To check the pressure of the secondary pressure relief
valve, do the following:

Connect a 0 to 20 MPa (0 to 3000 psi) gauge to
main test port on side of control valve.

Start engine and operate hydraulic system to
warm oil temperature to 55 to 65 C (130 to
150 F). Run engine at approximately 1000 rpm
when making pressure checks.

Check secondary relief valve by tilting mast
backward until it stops. Hold lever and check
reading of gauge when relief valve opens. If pres-
sure is not correct, replace relief valve. See the
Specifications section for the correct pressure.

2000 SRM 754

Troubleshooting

Specifications

Function

Specification

Pump input to valve..................................................................

125 liter/min (33 gal/min)

Steering output flow

H3.50-120XM (H70-120XM).................................................

17 liter/min (4.5 gal/min)

S3.50-120XM (S70-120XM) ..................................................

Nonpriority Flow

Main relief valve (lift) operating pressure, (Port B1*)............

21.49 to 22.51 MPa (3125 to 3275 psi)

Secondary relief valve (tilt and auxiliary) operating
pressure (Ports A2, A3, B2, B3*)..............................................

14.99 to 16.01 MPa (2175 to 2325 psi)

Steering relief valve operating pressure
(At steering supply port)...........................................................

10.35 to 11.05 MPa (1450 to 1550 psi)

Operating temperature.............................................................

30 to 95 C ( 20 to 200 F)

Centering spring force:

At neutral ..............................................................................

15.5 kg (34.18 lb) max

At full force............................................................................

20.0 kg (44.1 lb) max

Oil type ......................................................................................

SAE 10 W (per HCE-4) or ISO VG32

*For port locations, refer to Figure 4. Port A1 is closed.

Troubleshooting

PROBLEM

POSSIBLE CAUSE

PROCEDURE OR ACTION

Slow or no movement of
cylinders.

Air is in hydraulic system.

Remove air from hydraulic system.

Hydraulic pump is worn or damaged.

Repair or replace hydraulic pump.

Restriction in the hydraulic lines.

Repair hydraulic lines.

Cylinder seals are damaged.

Repair cylinders.

Load is greater than capacity.

Reduce load.

Linkage is disconnected or damaged.

Repair linkage for control levers.

Pressure relief valve(s) is not within
specifications.

Replace relief valve.

Large leaks between spool and bore.

Replace control valve.

Troubleshooting

2000 SRM 754

PROBLEM

POSSIBLE CAUSE

PROCEDURE OR ACTION

Oil leaks at the end of a
spool.

Seal for spool is damaged.

Replace seal.

Spool is damaged.

Replace control valve.

Valve body is damaged.

Replace control valve.

Spool will not move or is dif-
ficult to move.

Linkage is disconnected or damaged.

Repair linkage.

Return spring is damaged.

Replace spring.

Spool or bore is damaged.

Replace control valve.

Spool will not return to Neu-
tral.

Linkage is disconnected or damaged.

Repair and adjust linkage.

Return spring is damaged.

Replace spring.

Dirt between spool and bore.

Clean valve.

Spool is bent or damaged.

Replace control valve.

Hydraulic pressure is above
specifications.

Pressure relief valve(s) is damaged.

Replace relief valve.

Restriction in return line.

Clean or replace return line or filter.

Tilt cylinders extend when
tilt spool is in Neutral posi-
tion.

Cylinder seals have leaks.

Repair tilt cylinders

Oil leaks between control valve spool
and bore.

Replace valve section.

Hydraulic lines have leaks.

Repair or tighten lines or fittings.

Tilt cylinders extend sud-
denly when tilt spool is
moved to Back Tilt posi-
tion.

Tilt spool is damaged.

Replace tilt spool or control valve.

2000 SRM 754

Troubleshooting

PROBLEM

POSSIBLE CAUSE

PROCEDURE OR ACTION

Tilt cylinders extend sud-
denly when tilt spool is
moved

Forward

Tilt

position.

Tilt spool is damaged.

Replace tilt spool or control valve.

Lift cylinders retract when
lift spool is in Neutral posi-
tion.

Cylinder seals have leaks.

Repair lift cylinders.

Hydraulic lines have leaks.

Repair or tighten lines or fittings.

Leaks between lift spool and bore.

Replace control valve.

NOTES

____________________________________________________________

TECHNICAL PUBLICATIONS

2000 SRM 754

12/03 (9/01)(8/99) Printed in United Kingdom

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