Champion R Series Operation & Service Manual page 21

Guide to Maintenance (continued)
PILOT VALVE: The pilot valve actuates the head unloader mechanism to provide a means of stopping or
starting the compression of air by the compressor without stopping or starting the engine.
The pilot valve is pre-set from the factory, according to the order specification. Only a certified field
service technician should make adjustments to the pilot valve.
PILOT VALVE PRESSURE ADJUSTMENT
Proceed with the following instructions while compressor is running:
1. Loosen locknut (4) and back off several turns. Do not turn differential pressure adjustment nut
(3).
2. Check reading on the tank pressure gauge. Set the compressor maximum pressure by turning
threaded cap (1) clockwise to increase pressure or counter clockwise to decrease pressure.
3. After pressure is set, tighten locknut (4). Be careful not to move threaded cap (1).
PILOT VALVE DIFFERENTIAL PRESSURE ADJUSTMENT
Proceed with the following instructions while compressor is running:
1. Loosen locknut (2) and back off several turns.
2. Check reading on the tank pressure gauge. Set the pressure to 30 psig differential (unload at
170 psig, reload at 140 psig). Turn nut (3) clockwise to increase differential pressure or
counterclockwise to decrease differential pressure.
3. After pressure is set, tighten locknut (2). Be careful not to move nut (3).
MOUNTING
THREAD
R-Series Engine
Operation & Service
SENSING TUBE
FROM AIR RECEIVER
21
1
4
3
2
ACTUATING TUBE
TO HEAD UNLOADERS
CQF3474 v.00
Jan.2018