Hale 80FC - Manual (Page 50)

❑ Operation
50 Pump Ends
p/n: 029-0020-61-0
Water temperatures above 95°F (35°C) cause a noticeable decrease in lift
when drafting. Also see Figure F-2: “Lift Loss from Temperature” on page 147.
Barometric pressures below 29” Hg. can also limit lift when drafting. High ele-
vations and storm conditions can affect maximum flow available from any pump.
Also see Figure F-3a: “Lift Loss from Barometric Reading” on page 147.
3.5 RELIEF VALVE PROCEDURES
Be sure to select the correct procedure based on how the skid or trailer is
equipped. (See Figure 3-2: “TPM / PMD Relief Valve Control” on page 51.)
Some engines may utilize a governor in place of the relief valve.
Standard Relief Valve Procedures
1. Increase the engine RPM to the desired pump operating pressure while
reading the discharge pressure gauge.
2. Turn the handwheel slowly counterclockwise until the relief valve opens.
The pilot light illuminates and the master pressure gauge drops a few PSI
(BAR).
3. Turn the handwheel slowly clockwise until the master pressure gauge rises
to the desired pressure and the pilot light goes out.
4. When the pump is not in operation, turn the handwheel clockwise to a posi-
tion slightly above the normal operating pressure. When the pump is put
into operation again, reset the valve to the desired operating pressure.
More complete and detailed information is found in the relief valve manual.
TPM Relief Valve Procedures
1. Set the pressure indicator on the PMD control valve to a position slightly
above the normal operating pressure (even before water starts to flow).
(See Figure 3-2: “TPM / PMD Relief Valve Control” on page 51.)
2. When normal operating pressure is achieved (as indicated on the master
pressure gauge while the pump is discharging water), slowly move the
adjusting handwheel counterclockwise until the relief valve opens.
3. The AMBER indicator light illuminates.