TM 5-3805-260-24TRACTOR-SCRAPPER SCHEMATIC1. Air compressor.13. Scraper air chamber and24. 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 window30. Control valve for8. Rotochamber for parkingwasher.emergency brakes.brake.19. Reservoir for window31. Control valve for parking9. Tractor air chamberand washer.brake.master cylinder.20. Warning buzzer.32. Residual pressure valve10. 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 twosections, air flow and oil flow.The oil flow comes from an air actuated hydraulicbrake system. The tractor and scraper have their ownair ’chamber and master brake cylinder (9) and (13),brake lines and caliper assemblies. Each mastercylinder has its own fluid reservoir and the maintenancefor the level of the fluid is done separately.When the brake pedal is pushed air extends the airchamber rod and it pushes the master cylinder piston.Piston movement sends oil through the lines into thecaliper assemblies. At each caliper the oil pushes on theback of the pistons and the pistons push the friction padsagainst the brake discs.2-130
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