JLG 80HX_HX+6_HXER Service Manual - Manual (Page 31)

SECTION 2 - PROCEDURES
3120863 – JLG Lift – 2-9
2.7 WEAR PADS
1. Shim up wear pads within 1.5 mm tolerance
between wear pad and adjacent surface.
2. Replace wear pads when worn within 3 mm of
threaded insert.
2.8 CYLINDER CHECKING PROCEDURE
NOTE: Cylinder checks must be performed any time a cylin-
der component is replaced or when improper system
operation is suspected.
Cylinders Without Counterbalance Valves -
Steer Cylinder and Master Cylinder
1. Using all applicable safety precautions, activate the
engine and fully extend the cylinder to be checked.
Shut down the engine.
2. Carefully disconnect the hydraulic hose from the
retract port of the cylinder. There will be initial weep-
ing of hydraulic fluid which can be caught in a suit-
able container. After the initial discharge there
should be no further leakage from the retract port.
3. Activate the engine and extend the cylinder.
4. If cylinder retract port leakage is less than 6-8 drops
per minute, carefully reconnect the hose to the port
and retract the cylinder. If leakage continues at a
rate of 6-8 drops per minute or more, cylinder
repairs must be made.
5. With the cylinder fully retracted, shut down the
engine and carefully disconnect the hydraulic hose
from the cylinder extend port.
Figure 2-3. Boom Positioning and Support - Cylinder Repair