Midland SIDE DUMP GRAVEL TRAILER Operator's Manual page 79

5.2.9 SLACK ADJUSTERS (cont'd)
5.2.9.2 AUTOMATIC SLACK ADJUSTER MAINTENANCE (cont'd)
Free Stroke Above the Range Free Stroke Above the Range
If the free stroke is above the range and the applied stroke is too long, there is a problem with the foundation
If the free stroke is above the range and the applied stroke is too long, there is a problem
brake or the adjuster. Check the following:
with the foundation brake or the adjuster. Check the following:
Component
Camshaft
Camshaft bushings
Camshaft bushings
Air chamber return springs
Air chamber push rod
Air system
Shoe return springs
Automatic brake adjuster
Automatic brake adjuster
Free Stroke Below the Range
If the free stroke is less than 3/8", a dragging brake can occur. Check the following:
Component
Wheel bearing
Automatic brake adjuster
Automatic brake adjuster
Cause
Binding
Excessive movement
Binding shaft
Broken, weak, missing
Binding on chamber housing
Not exhausting completely
Broken, weak, missing
Unknown
Unknown
Cause
Out of adjustment
Unknown
Unknown
Free Stroke = B minus A
Applied Stroke = C minus A
A
(Fully Retracted)
B
(Drum Contact Using a Lever)
C
(Brake Application at 90-100 PSI
reservoir pressure.)
Action
Remove, replace, lubricate camshaft
Remove and replace cam bushings per OEM specs
Lubricate camshaft bushings or replace
Replace chamber
Check adjuster for proper shimming and air chamber
position for proper adjuster arm length
Check for cause of air problem and repair
Replace springs
Check automatic brake adjuster for proper
installation. Refer to Installation Instructions at
www.haldex.com.
Refer to Automatic Brake Adjuster Checking
Procedures and Operational Check at www.haldex.com.
Action
Readjust per OEM specs
Check automatic brake adjuster for proper control
arm position. Refer to Installation Instructions at
www.haldex.com.
Refer to Automatic Brake Adjuster Checking
Procedures and Operational Check
Figure 13
Stroke Measurements
(taken from face of air
chamber to center of
clevis pin)
at www.haldex.com .
8
67