TM 5-3805-260-24
TRACTOR-SCRAPPER SCHEMATIC
1. Air compressor.
13. Scraper air chamber and
24. Horn.
2. Air compressor governor.
master cylinder.
25. Control valve for horn.
3. Reserve tank.
14. Right scraper brake.
26. Differential lock valve.
4. Check valve.
15. Left tractor brake.
27. Double check valve.
5. Relief valve.
16. Air pressure gauge.
28. Brake control valve.
6. Dry tank.
17. Junction block.
29.Low air pressure indicator.
7. Wet tank.
18. Control valve for window
30. Control valve for
8. Rotochamber for parking
washer.
emergency brakes.
brake.
19. Reservoir for window
31. Control valve for parking
9. Tractor air chamber
and washer.
brake.
master cylinder.
20. Warning buzzer.
32. Residual pressure valve
10. Right tractor brake.
21. Control valve for seat(check valve).
11. Residual pressure valve.
suspension.
33. Left scraper brake.
(check valve).
22. Shock absorber for seat.
34. Air Dryer (613BSNS1,
613BSS1)
12. Quick release valve.
23. Emergency pilot valve.
The tractor-scraper system is divided into two
sections, air flow and oil flow.
The oil flow comes from an air actuated hydraulic
brake system. The tractor and scraper have their own
air ’chamber and master brake cylinder (9) and (13),
brake lines and caliper assemblies. Each master
cylinder has its own fluid reservoir and the maintenance
for
the
level
of
the
fluid
is
done
separately.
When the brake pedal is pushed air extends the air
chamber rod and it pushes the master cylinder piston.
Piston movement sends oil through the lines into the
caliper assemblies. At each caliper the oil pushes on the
back of the pistons and the pistons push the friction pads
against the brake discs.
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