119
l) Take down the pump from the
clamping. Apply lubricating grease on the
outside circle and lip of the oil seal, install
it on the front cover with mould.
Fig. 5-39
m) Install the snap ring with callipers,
fixed the oil seal.
Fig. 5-40
4) Test run
The test run is a running-in period for the oil pump and a inspection whethter the
running of the pump is normal. Test the oil pump on the test station. And also the test can
be done on the forklift truck according to the following procedures:
(If the oil pump needs maintenance because of serious wear or its being stuck caused
by the hydraulic oil, change the hydraulic oil or filter before carrying out the test run on
the forklift truck.)
a) Install the pump onto the truck and the pressure gauge onto the pressure test end
of the control valve.
b) Loose the adjusting screw of the relief valve and make the pump running at a
speed of 500～1000rpm for 10 minutes. Make sure the oil pressure be lower than
10kg/cm
2
.
c) Increase the pump speed to 1500～2000rpm for 10 minutes.
d) Make the pump running at a speed of 1500～2000rpm for 5 minutes and increase
the pressure to 210kg/ cm
2
by 20～30kg/cm
2
each time. Then make each oil circuit works
for 5 minutes and then change the oil filter.
Inspect the temperature of the oil, the temperature of the surface of the pump and the
running noise when increasing the oil pressure. If the oil temperature or the temperature
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