Manitowoc Published 09-09-16, Control # 229-09 8-27
MLC650 SERVICE/MAINTENANCE MANUAL UNDERCARRIAGE
CRAWLER TREAD SLACK ADJUSTMENT
Adjust the treads tighter when operating on firm ground and
looser when operating on soft ground (mud or sand).
Adjust tread slack at the roller end of each crawler.
:
See Figure 8-16 for the following procedure.
1. Thoroughly clean the crawler to be adjusted.
2. Remove the covers (2) from both sides of the crawler
frame.
3. Loosen the nut (1) on each side of the crawler roller (8).
4. Connect the hand pump to the quick connect fitting (3)
located on the inside jack cylinder (4) of the crawler
tensioning assembly.
NOTE: The crawler tensioning assembly consists of two
jack cylinders, one on the outside of the crawler
frame and the other on the inside.
5. Using the hand pump, extend the crawler jack cylinder
against the rod (5). The jack cylinders should extend
equal distance at both sides of the crawler frame. For
operating instructions of the hand pump, see Operating
the Hand Pump on page 8-28.
NOTE: Erratic operation indicates air in the system. To
bleed the jack cylinders, see Remove Air from the
Crawler Tensioning Assembly on page 8-29.
For hand pump maintenance, see Maintenance on
page 8-29.
6. Add or remove an equal thickness of shims (6) on both
sides of the crawler frame. Shim thicknesses are as
follows:
• 06 mm (0.24 in)
• 12 mm (0.47 in)
• 25 mm (0.98 in)
7. Relieve the pressure in the crawler tensioning assembly
and remove the hand pump.
8. Travel the crane forward or reverse to tighten the shims.
9. Check for correct crawler tread slack (see Crawler Tread
Slack Measurement on page 8-26). Readjust as
required by performing step 4
through step 8.
10. Verify that the inside and outside crawler frame
dimensions, measured from the shaft center punch line
(10) to the crawler frame center punch line (11), are
within 3 mm (0.12 in) of each other.
11. Lubricate the nuts and bolts at the crawler rollers with
Never-Seez or an equivalent anti-seizing lubricant.
12. Tighten the nut (1) on the bolt at each side of crawler
roller to 2712 Nm (2,000 ft-lb).
13. Install the cover on both sides of the crawler frame.
NOTE: The extreme limit of the tread adjustment occurs
when the bolts are tight against the front end of the
slots in the crawler frame. One crawler tread can
be removed when this limit is reached.
CAUTION
Avoid Tread Pin Damage!
Do not adjust the treads too tightly or the tread pins will
wear rapidly and may break. Dirt buildup will tighten the
treads further, increasing the possibility of damage.
Tight treads require more drive torque, resulting in faster
wear and increased fuel consumption.
CAUTION
Avoid Parts Wear!
The crawler roller and tumbler must be square with the
crawler frame to within 3
mm (0.12 in) or parts will wear
rapidly.
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