Unloader Adjustment Info

Instructions for Adjusting Minimatic 4/B Unloaders

[Please note that we recommend that this procedure be done by a qualified high pressure pump service technician. Failure to properly adjust can cause serious damage to equipment and body.]

Minimatic 4/B Please follow these steps to adjust the pressure when adjusting or installing a new Minimatic 4/B unloader:
Step 1: Remove black cap (position #49).
Step 2: Loosen nut (position #3) with 10mm wrench.
Step 3: Turn brass (position #4) clockwise until it stops.
Step 4: Start pump, watch pressure gauge and turn (position #2) using 3mm hex clockwise until recommended/rated pressure is obtained. Line pressure will be approximately 200 psi less than actual head pressure. DO NOT set line pressure to rated.
Step 5: Release trigger and make sure there is minimal spike (200-300 psi). Repeat this step 2 or 3 times.
Step 6: Tighten nut (position #3) down against (position #4).
Step 7: Replace black cap (position #49).
Note: Now pressure can be decreased by turning black knob (position #1) counterclockwise, but the pressure cannot be increased to a rating higher than was set.

Mounting Bolt Torque Specifications
Inlet: 354 in/lbs 30ft/lbs
Discharge: 266 in/lbs 22 ft/lbs


Instructions for Adjusting AR Gymatic Unloaders

[Please note that we recommend that this procedure be done by a qualified high pressure pump service technician. Failure to properly adjust can cause serious damage to equipment and body.]

Gymatic Please follow these steps to adjust the pressure when adjusting or installing a new Gymatic unloader:
Step 1: Remove black cap (position #1) from knob.
Step 2: Loosen bolt (position #2) with 6mm hex wrench.
Step 3: Loosen nut (position #3) to top of bolt (position #2).
Step 4: Turn the black knob (position #4) clockwise until it stops.
Step 5: Start pump, watch pressure gauge and turn bolt (position #2) until recommended/rated pressure is obtained.
Step 6: Release trigger and make sure there is minimal spike (300-400 psi). [Repeat this step two or three times.]
Step 7: Spin nut (position #3) down. While holding bolt (position #2) in place with hex wrench, use special tool (AR1560590) or extended 13mm socket wrench to hand tighten nut (position #3) against black knob (position #4).
Step 8: Replace black cap (position #1).
Note: Now pressure can be decreased by turning black knob (position #4) counterclockwise, but the pressure cannot be increased to a rating higher than was set.

Mounting Bolt Torque Specifications
Inlet: 354 in/lbs 30ft/lbs
Discharge: 221 in/lbs 19 ft/lbs

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