8000 SRM 707
Lift and Tilt System Leak Check
Figure 44. Lift Chain Adjustment, Pin-Type
Carriage
Legend for Figure 44
1.
LOAD BACKREST
2.
FORK PIN
3.
DISTANCE FROM FORK PIN TO FLOOR
Lift and Tilt System Leak Check
LIFT CYLINDER, LEAK CHECK
1.
Operate hydraulic system. Put a capacity load
on forks and raise and lower load several times.
Lower load and tilt mast forward and backward
several times. Check for leaks.
2.
Raise carriage and load 1 m (3 ft). If the car-
riage slowly lowers when the control valve is in
the NEUTRAL position, there are leaks inside
the hydraulic system. The maximum speed the
carriage is allowed to lower is 50 mm (2 in.) per
10 minutes when the hydraulic oil is 30 C (86
F)
.
If the oil temperature is 70 C (158
F)
, the max-
imum speed the carriage can lower is 150 mm
(6 in.) per 10 minutes.
3.
Check lift cylinder for internal leaks. Remove
load from forks. Install gate valve in supply line
between main control valve and mast. Put a ca-
pacity load on forks again. Raise carriage 1 m
(3 ft). Close gate valve. If the carriage or mast
weldments lower slowly, the seals in the lift cylin-
ders have leaks.
4.
If the carriage does not move, open gate valve
and check movement again. If the carriage low-
ers when the gate valve is open, check for leaks in
hydraulic lines and fittings. If no leaks are found,
the main control valve can be worn or damaged.
Remove load from forks.
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