Doosan 7/53, Operation And Maintenance Manual

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24 MAINTENANCE
7/53
BRAKES
Check and adjust the brake linkage at 500 miles (850Km) then every
3000 miles (5000Km) or 3 months (whichever is the sooner) to
compensate for any stretch of the adjustable cables. Check and adjust
the wheel brakes to compensate for wear.
Adjusting the overrun braking system
1. Preparation
Jack up the machine
Disengage the handbrake lever [1].
Fully extend the draw bar [2] on the overrun braking system.
Requirements:
During the adjustment procedure always start with the wheel brakes.
Always rotate the wheel in the direction of forward movement.
Ensure that an M10 safety screw is fitted to the handbrake pivot.
The brake actuators must not be pre-tensioned - if necessary loosen
the brake linkage [7] on the brake equalisation assembly [8].
Check that brake actuators and cables [11] operate smoothly.
2. Brake Shoe Adjustment
Tighten adjusting screw [12] clockwise until the wheel locks.
Loosen adjusting screw [12] anti-clockwise (approx. ½ turn) until the
wheel can be moved freely.
Slight dragging noises that do not impede the free movement of the
wheel are permissible.
This adjustment procedure must be carried out as described on both
wheel brakes.
When the brake has been adjusted accurately the actuating distance
is approximately 5-8mm on the cable [11]
1. Handbrake lever
2. Draw bar and bellows
3. Handbrake lever pivot
4. Transmission lever
5. Brake cable
6. Breakaway Cable
7. Brake linkage
8. Equalisation assembly
9. Compression spring
10.Equaliser plate
11.Cable
CAUTION: The compression spring [9] must only be lightly pre-
tensioned and when operating must never touch the axle tube.
Never adjust the brakes at the brake linkage [7].
12.Adjusting screw
13.Cable entry
Width across flats of adjusting screw [12]
Brake size Key width
160x35 / 200x50 SW 17
250x40 SW 19
300x60 SW 22