Manitowoc 3900W - Page 193

MANITOWOC ENGINEERING CO.
Division of The Manitowoc Company, Inc,, Manitowoc, Wisconsin 54221
BRAKE PEDAL AND LATCH INSPECTION
Manual Drum and Swing Brakes
3000 thru 4000W
GENERAL
This folio contains specific inspection and replacement
information for the brake pedal and pedal latch on manually
controlled drum working brakes and swing brakes.
Refer to Maintenance Checklist and Brake Adjustment
Folios in crane Service Manual for inspection intervals and
adjustment procedures.
FALLING LOAD HAZARD!
Brake pedals and latches for drum
working brakes and swing brakes must be maintained
in proper working order to ensure proper brake
application.
Failing to inspect pedals and latches at regular intervals
and replace defective parts can result in brakes
releasing unexpectedly, Loads can fall and upperworks
can swing without notice.
Death or serious injury to personnel can result.
INSPECTION
The inspection areas covered in this folio are:
• Pedal Travel (page 1)
• Tooth Clearance (page 1)
• Pedal Latch Wear (page 2)
• Tooth Engagement (page 2)
• Tooth Root Wear (page 2)
• Pedal Pin and Hole Wear (page 3)
• Swing Brake Guide Bar Installation (page 3)
FALLING LOAD HAZARD!
Avoid death or serious injury to
personnel. Perform following steps before inspecting
brake pedals and latches:
• Apply swing lock.
• Land all loads so load lines are slack.
• Stop engine.
• Attach warning tag to start controls alerting
personnel that crane is being serviced and must not
be started.
Pedal Travel (Figure 1)
Unlock pedal lock, if equipped.
Depress heel of pedal, and push pedal down fully. Then
raise pedal fully. Pedal must lower and rise freely without
any binding or interference with adjacent parts.
If binding or interference occurs, determine cause and
correct problem. Reshape pedal tongue if necessary (see
Pedal Installation and Shaping instructions on page 4 in
this folio).
Tooth Clearance (Figure 1)
Unlock pedal lock, if equipped.
Depress heel of pedal and push pedal down fully. Each
pedal tooth must clear pedal latch. Amount of clearance
does not matter as long as front side of pedal tongue does
not contact adjacent parts. Reshape pedal tongue if teeth
contact pedal latch (see Pedal Installation and Shaping
instructions on page 4 in this folio).
Dep
ol
Pedal
A623
Lower and Raise
| Pedal Fully
@1993 Manitowoc
FIGURE 1
7-1-93 BRAKE PEDAL AND LATCH INSPECTION FOLIO 1448-1
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