NMC-WOLLARD MB-4 200-DF, Operation, Maintenance And Parts Manual

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M200 MB4 Tow Tractor Manual No. 42975
8.9.5 Air Chamber Linkage Adjustment
(Air Brakes)
1. This adjustment is linkage adjustment.
To adjust calipers refer to Adjust Caliper.
Caliper must be adjusted before this pro-
cedure is performed.
2. Start the engine and release the parking
brake, which applies pressure to the air
chamber. Then turn engine off but do
not apply the parking brake, ie, keep the
chamber pressurized.
Pushrod moves very
quickly with a very large force. Keep
clear of pushrod and caliper lever while
pressurizing and de-pressurizing. Do
not attempt to uncouple from caliper le-
ver while under tension.
Improperly adjusted
park brake may not apply enough force,
or may apply too much force and break
caliper. In either situation, park brake
will be non-functional with no obvious
signs to operator. Replace components
until assembly can be adjusted within
ALL limits in figure 8-4.
3. Set the linkage to the 14.37” length
shown on Figure 8-4 while maintaining
the two 1.56” minimum dimensions.
4. The air chamber linkage clevis should
now connect to the innermost of the
three holes on the cam lever without ap-
plying any pressure to the lever. If it does
not, make slight adjustments at either
the clevis or the linkage link so it does.
NOTE: If installing a new caliper assembly
or new cam lever, the caliper lever will re-
quire drilling a new hole to hook the air
chamber linkage clevis to. See Figure 8-4.
PAGE 8-8
NOVEMBER 30, 2005
FIGURE 8-4. AIR CHAMBER LINKAGE
ADJUSTMENT