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9-10
MAST
1)
Problem
Cause
Remedy
Forks fail to lower.
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Deformed mast or carriage.
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Disassemble, repair or replace.
Fork fails to elevate
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Faulty hydraulic equipment.
Â
Deformed mast assembly.
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See troubleshooting hydraulic pump
and cylinders in section 6, hydraulic
system.
Â
Disassemble mast and replace
damaged parts or replace complete
mast assembly.
Slow lifting speed and
insufficient handling capacity.
Â
Faulty hydraulic equipment.
Â
Deformed mast assembly.
Â
See troubleshooting hydraulic pump
and cylinders in section 6, hydraulic
system.
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Disassemble mast and replace
damaged parts or replace complete
mast assembly.
Mast fails to lift smoothly.
Â
Deformed masts or carriage.
Â
Faulty hydraulic equipment.
Â
Damaged load and side rollers.
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Unequal chain tension between
LH & RH sides.
Â
LH & RH mast inclination angles
are unequal. (Mast assembly is
twisted when tilted)
Â
Disassembly, repair or replace.
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See Troubleshooting Hydraulic
Cylinders, pump and control valve in
section 6, hydraulic system.
Â
Replace.
Â
Adjust chains.
Â
Adjust tilt cylinder rods.
Abnormal noise is produced
when mast is lifted and lowered.
Â
Broken load roller bearings.
Â
Broken side roller bearings.
Â
Deformed masts.
Â
Bent lift cylinder rod.
Â
Deformed carriage.
Â
Broken sheave bearing.
Â
Replace.
Â
Replace.
Â
Disassemble, repair or replace.
Â
Replace.
Â
Replace.
Â
Replace.
Abnormal noise is produced
during tilting operation.
Â
Insufficient lubrication of anchor
pin, or worn bushing and pin.
Â
Bent tilt cylinder rod.
Â
Lubricate or replace.
Â
Replace.
7. MAST AND FORK