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Plunger Pumps
Operating Instructions and Parts Manual RK Series Pumps
Please follow these easy steps to adjust the
pressure:
Step 1: Remove black cap (pos. #1) from knob.
Step 2: Loosen bolt (pos. #2) with 6mm hex
wrench.
Step 3: Loosen nut (pos. #3) to top of (pos. #2)
bolt.
Step 4: Turn the black knob (pos. #4) clockwise
until it stops.
Step 5: Start machine hold trigger on open
position and turn (pos. #2) bolt
until no further increase of pressure is
noticed, continue to hold
trigger open and turn counter-
clockwise until a slight drop in
pressure is felt.
Step 6: Spin (pos. #3) nut down. While holder
(pos. #2) bolt
in place with hex wrench, use special
tool (AR1560590)
Or extended 13mm socket wrench to
hand tighten
(pos. #3) nut against (pos. #4) black
knob.
Instructions for Adjusting Gymatic Unloader Valves
4
3
2
1
AR1560590
Nut holder for adjusting Gymatic Unloader
Mounting Bolt Torque Specifications
Inlet 354 in/lbs 30 ft/lbs
Discharge 221 in/lbs 19 ft/lbs
Step 7: Replace (pos. #1) black cap.
NOTE: Now pressure can be decreased by
turning black knob (pos. #4) counterclockwise,
but the pressure cannot be increased to a rating
higher than what max is set at by technician.