114
Fig. 5-21 hydraulic oil circuit
5.2 Maintenance，Fault Analysis and Remedies
5.2.1 Maintenance
Check if there is any seepage and serious oil leakage on the pipe fittings of hydraulic
drive system, hoist cylinder, tilt cylinder, oil pump, fully hydraulic steering gear and
steering cylinder before and after each shift. Check if the working oil inside work oil tank
is sufficient and check and clean the strainer mesh of oil filter mounted in the work oil
tank once every week.
Normally, change the oil in the work oil tank once every 1200-1500 hours of work
and mixed use of oils of different brand number is not allowed.
5.2.2 Maintenance of lift pump
1) Disassembly
Before disassembling the pump, put the removed parts on the paper or cloth. Don’t
damage the parts. (See Fig. 5-23)
a) Hold the pump cleaned in a vice by lightly clamping the flange section.
b) Remove bolts 11, pump cover 5, pump body 1.
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