4000 SRM 482
Lift Chains Check
6.
If the leak rate for the tilt function is greater than
specifications, remove the load from the forks.
Install a gate valve between the port at the rod
end of the tilt cylinder and the hydraulic line.
Put the load on the forks again. Close the valve.
Tilt the forks approximately halfway back.
If
the forks tilt slowly forward, the piston seals are
leaking.
7.
If the forks do not move, open the gate valve and
check for movement again. If the forks move for-
ward when the gate valve is open, check for leaks
in the hydraulic lines or fittings. If no leaks are
found, the main control valve or solenoid valves
can be damaged. Remove the load from the forks.
Lift Chains Check
GENERAL
NOTE:
These procedures are for both the two-stage
and three-stage mast assemblies.
CLEAN AND INSPECT
Read and follow the Safety Procedures When Work-
ing Near Mast as well as all WARNINGS and CAU-
TIONS.
WARNING
Cleaning solvents can be flammable and toxic
and can cause skin irritation. Wear protection
for eyes and skin.
When using cleaning sol-
vents, always follow the recommendations of
the manufacturer.
CAUTION
DO NOT use steam to clean the lift chains,
sheaves, or load rollers. The sheaves and bear-
ings are sealed and permanently lubricated.
Do not use compressed air on the bearings.
The air can force the lubricant out of the bear-
ings.
1.
Clean the lift chains using solvent. Inspect the
lift chains for wear or damage. See Figure 23.
A lift chain becomes longer when it is worn. If a
lift chain is 3 percent longer than a new lift chain,
the lift chain must be replaced. Use a chain scale
to measure the chains. If a chain scale is not
available, check the lift chains with the measure-
ments given in Figure 23.
WARNING
Never replace only the worn section of a lift
chain. Replace the complete chain. Never re-
place only one chain of a chain pair. Replace
both chains.
2.
Inspect the chain anchors and pins. Replace any
parts that are worn or damaged.
3.
Inspect the chain sheaves. Replace any parts
that are worn or damaged.
LUBRICATION
Clean and inspect the chains before lubrication. Use
SAE 30 engine oil as a lubricant for the chains. The
recommendation for adding lubricant is to remove
the chains from the lift truck and soak them in oil.
See Two-Stage Lift Chains, Remove and Install or
Three-Stage Lift Chains, Remove and Install to re-
move the lift chains for lubrication.
37
Summary of Contents for MAST N30XMH
Page 14: ...Two Stage Mast Assembly 4000 SRM 482 Figure 10 Two Stage Mast Assembly Dual Lift Cylinders 10 ...
Page 27: ...4000 SRM 482 Three Stage Mast Assembly Figure 18 Three Stage Mast Assembly 23 ...
Page 34: ...Three Stage Mast Assembly 4000 SRM 482 Figure 21 Hose and Cable Assemblies Outer Weldment 30 ...
Page 51: ......
