Komatsu PC130-7 Shop Manual page 100

TROUBLESHOOTING
3. Points to remember when handling hydraulic
equipment
With the increase in pressure and precision of
hydraulic equipment, the most common cause of
failure is dirt (foreign material) in the hydraulic cir-
cuit. When adding hydraulic oil, or when disassem-
bling or assembling hydraulic equipment, it is
necessary to be particularly careful.
1) Be careful of the operating environment.
Avoid adding hydraulic oil, replacing filters, or
repairing the machine in rain or high winds, or
places where there is a lot of dust.
2) Disassembly and maintenance work in the
field
If disassembly or maintenance work is carried
out on hydraulic equipment in the field, there is
danger of dust entering the equipment. It is also
difficult to confirm the performance after repairs,
so it is desirable to use unit exchange. Disas-
sembly and main-tenance of hydraulic equip-
ment should be carried out in a specially
prepared dustproof workshop, and the perfor-
mance should be confirmed with special test
equipment.
3) Sealing openings
After any piping or equipment is removed, the
openings should be sealed with caps, tapes, or
vinyl bags to prevent any dirt or dust from enter-
ing. If the opening is left open or is blocked with
a rag, there is danger of dirt entering or of the
surrounding area being made dirty by leaking oil
so never do this.
Do not simply drain oil out on to the ground, col-
lect it and ask the customer to dispose of it, or
take it back with you for disposal.
4) Do not let any dirt or dust get in during refill-
ing operations.
Be careful not to let any dirt or dust get in when
refilling with hydraulic oil. Always keep the oil
filler and the area around it clean, and also use
clean pumps and oil containers. If an oil clean-
ing device is used, it is possible to filter out the
dirt that has collected during storage, so this is
an even more effective method.
20-210
(1)
POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE
PC130-7