I
NSTRUCTION
M
ANUAL
19
B
RAKE
ADJUSTMENT
Brake shoe adjustment
Brake shoe adjustment re-establishes the brake lining-to-drum clearance
and compensates for lining wear.
1. Jack up the rear axle until the wheels clear the floor. The jack must
have a lifting capacity of at least 5500 lb (2500 kg). Support the com-
pressor on wooden blocks.
2. Release the parking brake completely.
3. Tighten the brake adjusting nut (1) on the rear wheels to expand the
brake shoes until they drag against the brake drums.
4. With the shoes against the drums, back off the adjusting nuts just
enough until the drums rotate freely. If the drums do not rotate freely,
remove the wheels and drums and blow out the dust and dirt from the
linings. With sandpaper, remove all rust from the shoes, reinstall the
drums and wheels and adjust the shoes. Remove the blocks and the
jack.
5. Road-test the compressor and check if the brake drums warm up. If the
brakes drag, back off the adjusting nuts one or two more notches as
required.
B
ELT
-
TENSIONING
ADJUSTMENT
Marker (1) must point between the minimum and maximum marks.
To correct the belt tension, proceed as follows:
1. Loosen bolts (2 and 3).
2. Loosen lock nut (4).
3. Tighten bolt (5) until marker (1) points at the maximum mark (6).
4. Tighten lock nut (4) and bolts (2 and 3).
P
RESSURE
REGULATING
The working pressure is determined by the tension of the spring in the reg-
ulating valve. This tension can be increased to raise the pressure and de-
creased to lower it by turning the adjusting wheel (1) of the regulating valve
clockwise and anti-clockwise respectively.
To adjust the normal working pressure, proceed as follows:
1. Start and warm up the engine.
2. Load the compressor and close the outlet valves.
3. Check the unloading pressure which should be approximately 14.5 psi
(1 bar) above the normal working pressure.
If the receiver pressure is less, loosen the checknut (2) and turn the
adjusting wheel (1), a fraction of a turn at a time, clockwise until the
right unloading pressure is obtained.
1. Adjusting nut, brake shoe
2. Torsion
axle
3. Brake
cable
2
3
1
1. Marker
2. Bolt
3. Bolt
4. Lock
nut
5. Regulation
bolt
6. Maximum
mark
7. Minimum
mark
Never exceed the maximum (unloading) pressure.
1. Adjusting
wheel
2. Checknut
2
3
5
4
1
6
7
2
1
