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NOTE: Should only be performed by ROLAIR factory authorized personnel.
RESETTING DIFFERENTIAL (2)
Make sure the top toggle lever is positioned as shown. (See Figure 3). Loosen locknut (1) by
turning counterclockwise several full turns. Gently turn differential setting (2) clockwise only until the
internal rod makes contact with the steel ball inside. After making contact, turn differential (2)
counterclockwise 1/4 turn. Secure position by tightening locknut (1) and proceed to top end setting.
TOP-END SETTING (4)
Loosen locknut (3) by turning counterclockwise several full turns. (4) is the top end setting.
Turning (4) clockwise will increase the top end pressure setting. Turning counterclockwise will decrease
the top end pressure setting. Begin at a low setting by turning counterclockwise one full turn. Proceed
to fine tuning instructions.
FINE-TUNING INSTRUCTIONS
Start engine/motor and observe tank pressure gauge. As tank pressure approaches 100-130
P.S.I.G., the pilot valve should begin unloading at felt muffler and cause gas engine to slow down to idle
speed. If pilot valve does not unload as tank pressure approaches 130 P.S.I.G., slowly turn top end
setting (4) counterclockwise until pilot starts to unload prematurely (at 100 P.S.I.G.), turn top end
setting (4) clockwise in 1/4 turn increments, tap down on the internal rod at toggle attachment and
repeat until desired top end setting is reached. If pilot valve begins to rifle (sputter), fine tune
differential setting (2) 1/16 turn in either direction until rifling stops. After fine tuning, secure setting
by turning locknuts (1 & 3) clockwise until tight. Hold setting (2 & 4) in place while turning locknuts to
secure.
Model
GD4000PV5H
NOTE: Engine RPM's (High – Low Settings) are factory set for maximum efficiency. Adjusting RPM's above factory specification
will void the warranty.
MAINTENANCE
PILOT VALVE ADJUSTMENT
GASOLINE ENGINE RPM SETTINGS
Top RPM
3100
- 13 -
(continued)
Idle RPM
1800
Pump RPM
1800-3100
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