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Troubleshooting

4000 SRM 764

Operator Platform Adjustment

1.

Install the load rollers on the operator platform.
Install the shims for the rollers in the same se-
quence on the stub shaft as they were before dis-
assembly. There must be no shims between the
roller and the weldment on the two top rollers
only.

2.

Use a crane to raise the operator platform within
the inner mast weldment. Find the point of tight-
est fit between the load rollers and the inner
mast weldments.

3.

Remove the operator platform from the mast.
Adjust the shim arrangement for each roller for
clearance between the roller and the inner mast
weldment. The clearance must be 0.1 to 0.8 mm
(0.004 to 0.031 in.) at the POINT OF TIGHTEST
FIT. Repeat Step 2 and Step 3 if necessary.

4.

Keep the shim arrangement on each side of the
carriage or operator platform approximately

equal. The operator platform must run parallel
with the inner mast weldment.

5.

After adjustment, lubricate the mast roller chan-
nels with a thin layer of grease.

CAUTION

Too much grease can cause the rollers to slide
and wear flat areas on the rollers.

6.

Slowly raise and lower the mast several times
without a load. The mast components must raise
and lower smoothly in the correct sequence. The
inner mast weldments and the operator platform
must lower completely.

NOTE:

Some parts of the mast move at different

speeds during raising and lowering.

Troubleshooting

PROBLEM

POSSIBLE CAUSE

PROCEDURE OR ACTION

No movement of lifting cylin-
ders.

Lift control linkage disconnected.

Connect lift control linkage.

No oil or not enough oil to supply
cylinders.

See the section Periodic Mainte-
nance 
for the correct oil level. Fill
hydraulic oil to correct level.

Hydraulic leaks, bad pump or pump
drive, relief valve set too low, bad
check valve.

Repair leaks. Replace pump or pump
drive. Adjust relief valve or replace
check valve.

Slow action of lifting cylin-
ders.

Not enough oil supply to cylinders.

See the section Periodic Mainte-
nance 
for the correct oil level. Fill
hydraulic oil to correct level.

Bad cylinder seals.

Replace cylinder seals.

Relief valve pressure is adjusted in-
correctly.

Adjust relief valve pressure.

20

Summary of Contents for A169

Page 1: ...MAST REPAIR R30XMF3 A169 R30XMA3 A185 N40 50EA N40 45ER C138 R30E EA R30EA FS D118 R30XMS2 D174 R30XMS3 E174 R30XM XMA XMF F118 R30XM2 R30XMA2 R30XMF2 G118 R30XM3 H118 PART NO 1466835 4000 SRM 764...

Page 2: ...cifications 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...

Page 3: ...assemble 13 Clean and Inspect 15 Lift Cylinders 15 Assemble 15 Install 16 Load Wheels Replacement 17 Lift System Leak Check 17 Lift Chain Adjustment 18 Mast Adjustments 19 Operator Platform Adjustment...

Page 4: ...THE QUALITY KEEPERS HYSTER APPROVED PARTS...

Page 5: ...d to the operator plat form by a pin near the edge of the platform See Figure 1 and Figure 2 The pin fits through a tube welded to the top of the fork The forks can be re moved by raising the operator...

Page 6: ...Forks 4000 SRM 764 1 FORK 2 PIN 3 WASHER 4 WASHER 5 WASHER 6 SPACER 7 SHIM 8 PEDAL 9 PALLET GRIP 10 PAWL Figure 2 Forks Pallet Grip and Operator Platform 2...

Page 7: ...will disconnect the lift chain s without changing the chain adjustment Care fully move the lift chain s through the sheave s and lay the chain s over the top of the lift truck 6 Use a ladder for acces...

Page 8: ...NING RING 3 WASHER BACK 4 RUBBER BUSHING 5 SHIMS 6 SCREW 7 LOCKWASHER 8 CYLINDER RETAINER 9 CUSHION 10 MAIN LIFT CYLINDER 11 LOCK PLATE 12 SCREW 13 LOCKWASHER 14 LIFT CHAIN 15 CHAIN ANCHOR 16 OUTER MA...

Page 9: ...t truck frame WARNING Before installing lift chains or cables use blocks and chains on the mast weldments and operator platform so they cannot move Make sure the moving parts are attached to a non mov...

Page 10: ...en all the mast weldments to gether so they cannot move Operate the crane until it gives support to the weight of the mast Move the crane to a position so the mast assem bly will be lifted vertically...

Page 11: ...4000 SRM 764 Two Stage Mast Figure 4 Two Stage Mast Assembly 7...

Page 12: ...ing near the center of the lift cylin der in the same manner used for the mast weld ment removal Remove the capscrew washer and spacer that fastens the cylinder to the outer mast channel See Figure 3...

Page 13: ...IONS FOR MEASURING CHAIN WEAR ARE SHOWN ON THE CHAIN WEAR SCALE Pitch Total Lengths of 20 Links Pitch of New Chain Wear Limit The Maximum Length of 20 Links 12 7 mm 0 50 in 15 9 mm 0 625 in 19 1 mm 0...

Page 14: ...to move the cylinder into position in the outer mast weldment Install the snap ring on the bottom of the cylinder In stall the capscrew washer and spacer to fasten the cylinder shell to the channel Re...

Page 15: ...ast directly over the open trunnions and lower the mast until it rests on the trunnion blocks as shown in Figure 6 Make sure the align ment block is resting in the angled bracket shown in Figure 7 Ins...

Page 16: ...e hoist still attached to the platform raise the platform to a height that will allow for easy access under the platform NOTE If your truck is equipped with wire guidance refer to the Installation sec...

Page 17: ...hree stage mast is similar to the removal procedure for the two stage mast See Two Stage Mast Remove in this section for the correct procedure DISASSEMBLE NOTE This procedure does NOT include the remo...

Page 18: ...LIFT CYLINDER A LOCK PLATE B RETAINER 5 CHAIN ANCHOR 6 CHAIN SHEAVE ASSEMBLY RH A CHAIN SHEAVE B BALL BEARING C SNAP RING 7 MAIN LIFT CHAIN 8 LOAD ROLLER 9 FLOW REGULATOR HOUSING 10 HYDRAULIC TUBE MA...

Page 19: ...r is removed Remove the snap rings from all the sheaves Make a note of the shim arrangement as each sheave is removed All shim arrangements will be approximately the same when the mast is assembled 11...

Page 20: ...e chain anchors at the bot tom of the inner mast weldment Use new cotter pins during installation of the chains c Use the wires to pull the chains up between the chain sheaves and the top load rollers...

Page 21: ...system a Operate the hydraulic system Put a capacity load on the forks Make sure there is enough overhead clearance Raise and lower the load several times Check for leaks 2 Leaks inside the hydraulic...

Page 22: ...stments for wear 3 Remove the load from the forks Check the clear ance of the operator platform when the mast is fully extended The operator platform stops must not touch the stop at the top of the in...

Page 23: ...the following procedure to adjust the load rollers for the mast a Use a crowbar to move the mast weldments from side to side to measure the amount of movement Repeat in a minimum of three different p...

Page 24: ...th a thin layer of grease CAUTION Too much grease can cause the rollers to slide and wear flat areas on the rollers 6 Slowly raise and lower the mast several times without a load The mast components m...

Page 25: ...URE OR ACTION Rough movement of the mast assembly Air in the hydraulic system Purge air from system Bent rods cylinders with distortion or damage Repair or replace cylinders Mast assembly damaged or n...

Page 26: ...________________________________________ ____________________________________________________________ ____________________________________________________________ _____________________________________...

Page 27: ......

Page 28: ...TECHNICAL PUBLICATIONS 4000 SRM 764 1 12 2 01 9 00 6 99 Printed in U S A...

Page 29: ......

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