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Page Title:
TABLE 4. TROUBLESHOOTING GUIDE - continued |
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 TABLE 4. TROUBLESHOOTING GUIDE (Continued)
REMEDY
P R O B A B L E CAUSE
TROUBLE
1 1 . HYDRAULIC SYSTEM (Continued)
Find leak and correct.
Leak in hydraulic control
Pump not developing
system (cylinders or valves)
pressure (continued)
Pump must receive intake oil freely
Partially clogged intake line,
or cavitation will take place.
intake filter or restricted
intake pipe
Test by pouring oil on joints while
Small air leak at pump intake
Pump making noise
listening for change in operation.
piping joints
Tighten as required.
Repair or replace.
Air leak at pump shaft
packing
Must be open thru breather opening
Tank air vent plugged
or air filter.
Use recommended oils.
Too high oil viscosity
Replace shaft packing per preceding
Shaft packing worn
instructions.
Replace filter element.
Oil filter dirty
Fill sump tank.
Hydraulic oil level low
Forks do not lift to
maximum height
Report to designated authority.
Loss of oil pressure
Lift or tilt action fails
Worn or damaged lift piston
Replace seal.
Oil leak at top of lift
seal
cylinder assembly
Replace cylinder.
Scored cylinder wall
Clean out vent line. Replace if
Plugged vent line
collapsed.
Replace seal.
Worn seal
Oil leak around piston
rod at tilt cylinder
Replace rod and eliminate cause of
Scored piston rod
scoring which may be caused by mis-
alignment, worn bearing or foreign
matter.
Adjust chains.
Lift chains out of adjustment
With load centered on
lift forks load is lifted
unevenly
4-88
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