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DRIVE PULLEYS
TORQUE CHART (INCH/LB)
Pump Type
Direct Drive
K12
K17
K18
K24
K28
K30
Head Bolts
96
243
243
243
243
347
347
Cylinder Bolts
120
182
182
182
182
330
330
Bearing-Carrier Bolts
N/A
130
130
130
130
130
130
Connecting-Rod Bolts
N/A
121.5
121.5
121.5
121.5 121.5
173.6
Flywheel N/A
243
382
382
382
477
477
Determine pump type using suffix of Model number (Example: 4090HK17 uses K17 pump)
PILOT VALVE ADJUSTMENT
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.
SCHMIDT BELT-TIGHTENING DEVICE
(FOR GAS UNITS ONLY)
To tighten belt tension, proceed as follows:
1.
Loosen locknuts for engine hold-down bolts only until washers beneath
spin freely.
2.
Rotate 1/2” adjusting bolt clockwise until desired tension is reached. (See
Figure 4).
3.
Retighten locknuts to secure engine.
Drive pulleys must be properly aligned and drive belt
tension set to specification. Improper pulley alignment
and belt tension can cause motor overloading, excessive
vibration and premature belt and/or bearing failure.
(See Figure 5).
GASOLINE ENGINE RPM SETTINGS
Model
Top RPM
Idle RPM
Pump RPM
4090 Series
2950
1900
1025
1040 & 2040 Series
2775
1900
1175
6590 Series
3150
1900
1125
8422 & 8230 Series
3000
1900
900
NOTE: Engine RPM’s (High – Low Settings) are factory set for maximum efficiency. Adjusting RPM’s above
factory specification will void the warranty.
