Doosan 7/26E, Operation And Maintenance Manual

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MAINTENANCE 27
7/26E, 7/31E, 7/41
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]
3. Compensator assembly adjustment
Variable Height model
Fit an M10 safety screw to the handbrake pivot.
Disconnect the handbrake cable [5] at one end.
Pre-adjust brake linkage [7] lengthways (a little play is permissible) and
re-insert the cable [5], adjusting it to give a small amount of play.
Remove the M10 safety screw from the handbrake pivot.
All Models
Engage the handbrake lever [1] and check that the position of the
equaliser plate [10] is at right angles to the pulling direction. If
necessary correct the position of the equaliser plate [10] on the cables
[11].
The compression spring [9] must only be slightly pre-tensioned and
when engaged must not touch the axle tube.
4. Brake linkage adjustment
Adjust the brake linkage [7] lengthways without pre-tension and without
play in the transmission lever [4].
Readjustment
Engage the handbrake lever [1] forcefully a number of times to set the
brake.
Check the alignment of the equalisation assembly [8], this should be at
right angles to the pulling direction
Check the play in the brake linkage [7]
If necessary adjust the brake linkage [7] again without play and without
pre-tensioning
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