4-15
TMS800E SERVICE MANUAL BOOM
Published 01-29-2014, Control # 496-00
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
tele 1. When the boom is fully retracted or tele 1 is fully
extended, the valve on the right side of the boom is held
open to supply flow to the lower telescope cylinder. When
tele 1 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 lower
cylinder is fully extended before the upper cylinder starts to
extend. As tele 2 starts to extend, the valve on the right side
closes to shut off the flow to the second stage of the lower
cylinder.
1. Ensure the extend and retract cables are adjusted.
2. Extend boom out so that tele 1 is fully extended and tele
2 is bottomed out on stop block of tele 1.
3. Left side valve (extend side): Adjust nuts to move the
trigger weld until it just makes the pusher weld contact
the valve stem on the cam valve. Move nuts until the
pusher weld depresses the valve stem of the cam valve
(10 mm). Tighten the nuts.
4. Right side valve (retract side): through the access hole
on right side of base, tighten the bolt until the pusher bar
contacts the valve stem on the cam valve. Adjust bolt to
depress the valve stem of the cam valve (10 mm).
Tighten the nut.
Stop Block Adjustment
Add or remove shims as required so that stop blocks on a
given boom section (both sides) bottom out on the stop
blocks of the next section at the same time.
Front Upper Pad Adjustment
1. Using setscrews, adjust front upper wear pads so that
the wear pad is just touching or is no more than 2 mm
(0.079 in) away from contacting the next outer section at
the side surfaces, and is 4 mm to 6 mm (0.16 in to 0.24
in) away from contacting the next outer section at the top
surfaces.
2. Lock setscrews in place with locknut.
3. Tighten capscrews until pad support plate is held in
place against setscrews.
Rear Side Wear Pad Adjustment
1. Using shims, adjust wear pad so that the wear pad is
within 2 mm (0.079 in) from the side plate of the next
inner section. Equal number of shims should be on both
sides.
JIB AND RETRACTION CABLE
Maintenance
NOTE: For more detailed information concerning
maintenance of the extension and retraction
cables, refer to WIRE ROPE in Section 1 -
INTRODUCTION.
Inspection
The following information is taken from a National
Consensus standard as referenced by Federal Government
Agencies.
All wire rope will eventually deteriorate to a point where it is
no longer usable. Wire rope shall be taken out of service
when any of the following conditions exist.
• In running ropes, six randomly distributed broken wires
in one lay or three broken wires in one strand in one lay.
• Wear of one-third the original diameter of outside
individual wires. Kinking, crushing, bird caging, or any
other damage resulting in distortion of the rope
structure.
• Evidence of any heat damage from any cause.
• Reductions from nominal diameter of more than 5%.
• In standing ropes, more than two broken wires in one lay
in sections beyond end connections or more than one
broken wire at an end connection.
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).
CAUTION
Never handle wire rope with bare hands.
Reference Only
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