Manitowoc Published 11-22-17, Control # 257-02 8-17
MLC300 SERVICE/MAINTENANCE MANUAL UNDERCARRIAGE
CRAWLER PREVENTIVE MAINTENANCE
Crawler wear cannot be eliminated, but the rate of wear can
be reduced through regular preventive maintenance:
• Lubricate the crawlers as instructed in the Lubrication
Guide supplied with the crane.
• Keep the crawlers clean and avoid dirt buildup when
cutting.
• Keep all mounting bolts tight.
• Keep the treads properly adjusted.
• Inspect the crawler frames, rollers, and treads on a
regular basis.
• Check for oil leaks, excessive wear, cracks, and other
damage. Broken or cracked parts can indicate that the
treads are adjusted too tightly.
• Repair or replace damaged parts immediately to prevent
further damage.
CRAWLER TREAD SLACK MEASUREMENT
See Figure 8-9 for the following procedure.
Check tread slack (2) at the drive tumbler (1) end of each
crawler. Maintain equal tread slack at both crawlers.
1. Travel forward or reverse on a firm level surface until all
tread slack is in the top treads at the drive tumbler end of
the crawlers.
2. Place a straightedge (3) on top of the treads and
measure the tread slack between the straightedge and
the top of the tread at the lowest point.
• Tight limit gap—38,1 mm (1.5 in)
• Loose limit gap—76,2 mm (3.0 in)
3. If the slack exceeds the tight or loose limit, adjust
crawler tread slack (see Crawler Tread Slack
Adjustment on page 8-18.
FIGURE 8-9
Item Description Item Description
1 Drive Tumbler 7 Shim Storage Compartment
2 Tread Slack Dimension
• 38,1 mm (1.5 in)—Tight Limit
• 76,2mm (3.0 in)—Loose Limit
8Shim
• 12,7 mm (0.5 in)
• 25,4 mm (1.0 in)
3 Straightedge 9 Cover (qty 2)
4 Cover 10 Front Roller
5 Tensioning Cylinder 11 Tread
6 Rod 12 Nut and Bolt
Typical View Both Crawlers
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