99903514:TELESCOPIC CRANE: 3-9 SECTION 3: REPAIR
3-9-6: ROTATION MOTOR AND C’BAL
VALVE REMOVAL AND REPLACEMENT
(7020, 7025)
1. Shut down hydraulic system to ensure there
is no pressure in the system.
2. Remove the two input/output hoses con-
nected to the counterbalance valve.
3. Remove the four counterbalance valve
mounting bolts, being careful to cover parts
with clean rags to prevent contamination.
4. Remove the two hydraulic motor mounting
cap screws and carefully remove the motor.
5. Installation is the reverse of the steps above.
Be sure the mounting bolts for all three
items are torqued to the correct specifica-
tion.
3-10: WEAR PADS
Telescopic cranes booms extend and retract on
synthetic wear pads. The pads are either
dropped in place in a cavity or screwed in place.
Replace wear pads when:
The pads wear such that boom sections rub
on each other, resulting in metal scraping and/or
paint removal.
Wear pads can be located:
On the bottom and sides of the front of the
lower boom assembly.
On the top of the extension boom assembly
Around the pin which holds the main cylinder
in place.
Refer to the parts manual for specific wear pad
locations and styles for your telescopic crane.
To replace boom assembly wear pads:
1. Position the lower boom in a horizontal
position at a comfortable working height.
2. Extend the required extension boom section
sufficiently to allow access to wear pads.
Remove and replace. NOTE: In some
crane models, you may have to completely
remove the extension boom to access the
side wear pads. In other cases, you can lift
the end of the boom with a hoist, or use
ground pressure to SLIGHTLY raise the
boom to gain access to the wear pads.
3. To access the wear pads at the bottom of
the lower boom assembly, completely pull
out the extension boom section(s).
4. Remove the cap screws which hold the
pads in place. Remove and replace the
wear pads.
5. There may be round wear pads on the sides
of extension end of the lower boom. (Mod-
els 5525, 6025, and 6625). Install the drop-
in wear pad on the bottom of the boom, then
install the round wear pads, then install the
extensions.
6. Slide in new pad and replace retaining cap
screws. Relieve hoist pressure on boom.
Figure C-10: Wear Pad Example
20030115
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