BOOM RT9130E SERVICE MANUAL
4-20 Published 08-25-09, Control # 077-04
the left side of the boom’s left lift cylinder attachment lug.
The lift cylinder may need to be raised or lowered to aid
in the installation of the upper lift cylinder pin. This can
be done by using the jack on the lift cylinder support.
Shut down the engine.
12. Apply Grove-approved threadlocking compound to the
upper lift cylinder pin’s related capscrew. Secure the
upper pivot shaft to the boom with the capscrew and
washer.
13. Lower the jack on the lift cylinder support.
14. Remove the boom lifting device.
15. Activate the hydraulic system and remove the boom and
lift cylinder blocking devices. Lower the boom to
horizontal. Shut down the crane.
16. Connect the hydraulic lines to the lower telescope
cylinder as tagged prior to removal.
17. Feed the hoses through the rollers at the rear of the
base. Reach through the hole in the top of the base
section and attach the hose reel lines to the hydraulic
manifold as tagged prior to removal. Release the hose
reel in the turntable.
18. Install the base cover on top of the boom base section,
secure with four bolts and washers.
19. Connect any electrical wires as tagged prior to removal.
20. Refer to BOOM EXTENSION AND RETRACTION
CABLE ADJUSTMENT in this section for cable
adjustments.
21. Refer to CAM OPERATED CHECK VALVE
ADJUSTMENT in this section for valve adjustment.
Functional Check
1. Activate the hydraulic system and check for proper
operation and any leaks.
2. Ensure the boom will extend and retract properly.
3. Ensure the lift cylinder will not allow the boom to drift
down until the operator lowers it.
4. Ensure all electrical components disconnected during
removal are operating properly.
Inspection
Visually inspect telescoping sections for adequate lubrication
of all wear surfaces. Observe extended sections for
evidence of cracks, warping, or other damage. Periodically
check security of boom wear pads. Check boom nose
sheaves for security and freedom of movement.
Should boom chatter or rubbing noises in the boom occur, it
will be necessary to lubricate the telescope cylinder wear
pads. Refer to Section 9 - LUBRICATION.
Boom Alignment And Servicing
Refer to Section 9 - LUBRICATION for the proper lubricant.
Boom alignment is done as the boom sections are being
assembled into one another. A check and fine adjustment is
as follows.
1. Fully extend the boom horizontally.
2. Lubricate the boom bottom channels and top corners.
3. Shim the front top wear pads such that wear pad is just
touching or is no more than 2 mm (0.078 in) from
contacting the next section both at the top and side
surfaces of the top radius.
4. Retract and extend the boom; check for the high point
where the boom has brushed the wear pads at the
widest point.
5. Retract the boom sections to align the high point on the
boom section with the adjacent wear pads.
6. Add or subtract shims as necessary.
7. Attach a weight and extend the boom full length. Check
for side deflection.
Example: If the boom deflects to the left, the top left wear
pad would have shims added and the top right wear pad
would have shims removed.
Cam Operated Check Valve Adjustment
There are two cam operated valves mounted on the back of
the center mid section. When the boom is fully retracted or
the center mid is fully extended and the outer mid is fully
retracted, the valve on the right side of the boom is held open
to supply flow to the second stage of the lower cylinder.
When the center mid is fully extended, the valve on the left
side of the boom opens to supply flow to the upper telescope
cylinder. For a short period of time, both valves are open
because the booms second stage lower cylinder is fully
extended before the upper cylinder starts to extend. As the
outer mid starts to extend, the valve on the right side closes
to shut off the flow to the second stage of the lower cylinder.
CAUTION
If removed, ensure the large access covers on each side
of the boom base section are installed before extending
the boom.
CAUTION
When extending and retracting the boom during
alignment, movement should be stopped if a restriction is
encountered, and wear pads adjusted as necessary to
provide free travel of the affected boom section(s).
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