Power Train Disassembly & Assembly
Recommended Periodic
Service
1. Brake Adjustment – when the air chamber stroke
exceeds the limits shown below.
NOTE : The adjusting bolt on some manual slack
adjusters can reach the limit of its adjustment before
the linings are completely worn. To get additional
adjustment, do the following:
A. Completely retract the brakes.
B. Remove the slack adjuster.
C. Turn the camshaft to force the brake shoes apart.
Install the slack adjuster so that its arm is one
spline closer to the clevis than before.
D. Adjust the brake.
2. Lubrication – lubricate the brake and slack
adjuster.
3. Minor Inspection – at each lubrication.
4. Brake Reline – when the thickness of the lining is
1/4 inch (6.3 mm) at its thinnest point.
5. Drums – check at reline.
6. Major Inspection – at each reline.
7. Complete Overhaul – at every second reline or as
required.
A schedule for the periodic adjustment, cleaning,
inspection and lubrication of the brake equipment
must be made according to experience and the type
of operation.
Brakes must be adjusted as frequently as required
for correct operation and safety. The adjustments
must give correct clearance between the lining and
drum, correct pushrod travel and correct balance
between the brakes.
CAUTION : Do not let brake lining wear to the point
that the rivets or bolts touch the drum. Damage to
the drum will occur.
NOTE : Correctly adjust wheel bearings before
adjusting the brake.
Brakes must be cleaned, inspected, lubricated and
adjusted every time the wheel hubs are removed.
During a major overhaul, the following parts must be
carefully checked and replaced with genuine Doosan
Replacement Parts if required:
1. Backing plates or spiders for distortion and loose
bolts
2. Anchor pins for wear and correct alignment
3. Brake shoes for wear at anchor pin holes or roller
slots
4. Camshaft and camshaft bushings for wear
5. Shoe return springs must be replaced
6. Brake linings for grease on the lining, wear and
loose rivets or bolts
7. Drums for cracks, deep scratches or other
damage.
To help ensure maximum lining life, Doosan
recommends that springs, rollers, and anchor pins be
replaced at each reline.
Maximum Stroke at Which Brake Must be Adjusted.
80 - 90 PSI (550-620 kPa) Air Pressure In the Air
Chamber. Clamptype Air Chamber.
Chamber Stroke Length
Type (Size) Not to Exceed :
D100/120
30 2inches (50.8 mm)
D110/130S-5
D150
36 2-1/4 inches (57.1 mm)
D160S-5
68
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