99903514:TELESCOPIC CRANE:
2-7 SECTION 2: MAINTENANCE
2-5-4: HYDRAULIC FLUID DETERIORA-
TION
NOTE:
DO NOT USE ENGINE OIL AS AN ALTER-
NATIVE FOR HYDRAULIC FLUID. AUTO-
MATIC TRANSMISSION FLUID CAN BE
SUBSTITUTED FOR HYDRAULIC FLUID IN
LOW-TEMPERATURE, LOW-PRESSURE
HYDRAULIC APPLICATIONS.
Every 3 months, sample your hydraulic oil for
deterioration. Viscosity over 10% and a Total
Acid Number (TAN) over 3.0 are indications that
the oil has oxidized and should be replaced.
2-5-5: CHANGING HYDRAULIC OIL
Replace the oil in the hydraulic reservoir after
800 hours of operation or every 6 months,
whichever occurs first.
Purging the system requires a new oil supply
sufficient to completely fill the reservoir, lines,
cylinders, etc., and an extra quantity for loss
during this procedure. To minimize oil loss
during this process, operate the truck engine at
low RPM.
Two operators are required during the purging
operation: one to operate the crane controls and
the other to regulate pump output (engine
speed).
CAUTION
DO NOT ALLOW THE RESERVOIR OIL
LEVEL TO DROP BELOW 1/3 CAPACITY
DURING THIS OPERATION.
1. Locate the truck in an area with solid footing
and space to accomodate the full operating
range of the crane.
2. Stabilize the crane with the stabilizers.
Move the crane to 90° on either side of the truck.
Extend the lower and extension cylinders.
3. Disengage the PTO, drain the hydraulic oil
reservoir, remove the suction line filter and drain
all hoses. Disconnect the pressure hose
from the pump, drain and reassemble.
Replace the suction line filter element (Section
2-5-8) and reassemble the system.
NOTE
DISPOSE OF WASTE OIL IN A RESPON-
SIBLE MANNER, FOLLOWING ANY FED-
ERAL, STATE OR LOCAL REGULATIONS.
4. Remove the reservoir return line. Direct the
flow into a sump or waste container. Plug the
drain port on the reservoir and fill with new oil.
NOTE
READ AND FOLLOW THE FOLLOWING
INSTRUCTIONS WITHOUT INTERRUP-
TION OR STOP THE ENGINE AT THE END
OF EACH STEP. IF THIS IS NOT DONE,
EXCESS OIL WILL BE DISCHARGED
THROUGH THE DISCONNECTED VALVE
BANK RETURN HOSE.
5. Start the truck engine and engage the PTO
per instructions in the Operation section. Ro-
tate the crane 90°, retract the extension boom
and lower the lower boom to the lowest position.
6. Return the crane to its stowed position as
marked on the rotation system. Raise the
stabilizers. Shut off the engine.
7. All components of the system are now
purged. Replace the return line filter cartridge
and reinstall the return line on the reservoir.
8. Check hydraulic oil level. Top off if neces-
sary.
2-5-6: PURGING AIR FROM THE HY-
DRAULIC SYSTEM
Air trapped in the hydraulic cylinder will cause
an erratic “bumpy” motion. To expel the air:
1. Hold the control open for a few seconds
after the function has “bottomed out”.
2. Move the function in the opposite direction.
Again, hold the control open a few seconds after
the function has “bottomed out”.
3. Attempt to operate the crane in the normal
manner to determine if the air has been purged.
20030115
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