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Service and Repairs
General Precautions for Removing and Installing Hydraulic System Components
Before Repair or Replacement of Components
1. Before removing any parts from the hydraulic sys-
tem, park machine on a level surface, fully raise coring
head, engage parking brake, stop engine and remove
key from the ignition switch. Secure coring head with
service latch.
2. Clean machine before disconnecting, removing or
disassembling any hydraulic components. Make sure
hydraulic components, hoses connections and fittings
are cleaned thoroughly. Always keep in mind the need
for cleanliness when working on hydraulic equipment.
CAUTION
sure in the General Information section of this
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. See Relieving Hydraulic System Pres-
chapter.
3. Put caps or plugs on any hydraulic lines, hydraulic fit-
tings or hydraulic components left open or exposed to
prevent hydraulic system contamination.
4. Put labels on disconnected hydraulic lines and
hoses for proper installation after repairs are completed.
5. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Mark parts if necessary to make sure they will be aligned
properly when reinstalling hydraulic hoses and tubes.
After Repair or Replacement of Components
1. Check oil level in the hydraulic reservoir and add cor-
rect oil if necessary. Drain and refill hydraulic system
reservoir and change oil filter if component failure was
severe or system is contaminated (see Flush Hydraulic
System).
2. Lubricate O–rings and seals with clean hydraulic oil
before installing hydraulic components.
3. Make sure caps or plugs are removed from the hy-
draulic tubes, hydraulic fittings and components before
reconnecting.
4. Use proper tightening methods when installing hy-
draulic hoses and fittings (see Hydraulic Fitting Installa-
tion in the General Information section of this chapter).
5. After repairs, check control linkages and cables for
proper adjustment, binding and/or broken parts.
6. After disconnecting or replacing any hydraulic com-
ponents, operate machine functions slowly until air is
out of system (see Hydraulic System Start Up in this sec-
tion).
7. Check for hydraulic oil leaks. Shut off engine and cor-
rect leaks if necessary. Check oil level in hydraulic reser-
voir and add correct oil if necessary.
Check Hydraulic Lines and Hoses
or nozzles that eject hydraulic fluid under high
jected into the skin, it must be surgically re-
WARNING
Keep body and hands away from pin hole leaks
pressure. Use paper or cardboard, not hands, to
search for leaks. Hydraulic fluid escaping under
pressure can have sufficient force to penetrate
the skin and cause serious injury. If fluid is in-
moved within a few hours by a doctor familiar
with this type of injury. Gangrene may result from
such an injury.
Check hydraulic lines and hoses daily for leaks, kinked
lines, loose mounting supports, wear, loose fittings,
weather deterioration and/or chemical deterioration.
Make all necessary repairs before operating machine.
Hydraulic System Page 4 – 30 ProCore 648