Troubleshooting; Lift Assemblies; Hydraulic Cylinders - Yale 524150797 Maintenance Manual

Troubleshooting

LIFT ASSEMBLIES

PROBLEM
Forks fail to elevate.
Slow lifting speed and insufficient
handling capacity.
Forks fail to lower.

HYDRAULIC CYLINDERS

PROBLEM
Oil leaks from cylinder gland around
piston rod (An oil ring appears on
the piston rod).
Oil leaks from welded portion.
14
Troubleshooting
POSSIBLE CAUSE
Faulty hydraulic equipment.
Deformed lifting components.
Faulty hydraulic equipment.
Deformed lifting components.
Deformed forks.
Deformed lifting components.
Bent hydraulic cylinder piston rod.
POSSIBLE CAUSE
Foreign matter on packing.
Score on piston rod.
Scores on wiper ring lip.
Unusual distortion of wiper ring.
Chrome plating is stripped.
Cylinder tube damaged.
1900 YRM 1506
PROCEDURE OR ACTION
See Pumps and Hydraulic Cylin-
ders below.
Disassemble and replace dam-
aged parts.
See Pumps and Hydraulic Cylin-
ders below.
Disassemble and replace dam-
aged parts.
Disassemble, repair, or replace.
Disassemble, repair, or replace.
See Hydraulic Cylinders below.
PROCEDURE OR ACTION
Replace packing.
Remove any foreign
Smooth rod surface with an oil
stone. If oil still leaks, disassemble
and repack cylinder.
Replace wiper ring.
Replace wiper ring.
Replace piston rod or renew
chrome plating.
Replace cylinder tube.
matter.