Service manual
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4. PHASE LIMIT CALIBRATION
1. Attach a 50', 1/4" airless hose, airless gun with .017 tip and a 5000 psi glycerin î‚¿lled pressure gauge to the
pump.
2. Place the suction tube into a bucket of anti-freeze (or Coro-Chek) and water.
3. Turn pump on and turn up pressure control until the machine starts to prime.
4. Place the prime/pressure relief valve in the pressure (closed) position.
5. Pressurize pump to 600 psi.
6. Trigger the gun several times noting the deadband (the amount of pressure drop before the pump rebuilds
to set pressure).
7. If deadband is greater than 150 psi, adjust the phase limit trimpot so that the deadband is less than 150
psi and the pressure increase after the gun trigger is released is less than 250 psi. These pressures are
guidelines and may vary slightly from pump to pump.
8. Reattach pressure control assembly to unit.
PRESSURE CONTROL ASS'Y CALIBRATION (cont.)
Note: The 301-318 Revision E pressure control assembly has a reddish brown terminal
labelled "Inhibit Switch". At all times there should be a jumper on the two left terminals,
which are the closest to the "S2" connection. Also on the Revision E is a terminal labelled
"ON-SL". This terminal should always have a jumper on it.
Formerly known as the Low Voltage or Master Voltage Calibration