TM9-4310-396-13
MAINTENANCE OF PILOT VALVE AND CHECK VALVES
4-32.
REPLACE PILOT VALVE AND CHECK VALVES.
This task covers:
a.
Adjustment
c.
Installation
b.
Removal
INITIAL SETUP
Tools
Equipment Conditions :
General Mechanics Tool Kit
Engine stopped, para. 2-6.8
Materials/Parts
Tape, Teflon (Appendix E, item 6)
Check Valve (P/N P-7575)
Pilot Valve (P/N SV-25)
a.
Adjustment.
NOTE
Compressor in operation (para. 2-6.7) only for adjustment.
(1)
Start compressor and allow time for it to build air pressure and unload.
NOTE
Diesel engine will idle when adequate air pressure is reached.
(2)
Insure pilot valve is operating. Pull ring (5, figure 4-24) and make pressure adjustment to desired setting.
NOTE
One half turn of top nut (6) (1800) either decreases or increases line pressure by 20 psi.
NOTE
Do not adjust differential pressure adjustment nut (8). This is factory set.
(3)
Loosen locknut (7) to adjust pressure. Turn top nut (6) counterclockwise for lower pressure, turn
clockwise for higher pressure.
(4)
When desired pressure is reached (175 psi), hold top nut (6) in correct position and tighten locknut (7)
securely.
4-65
