Hale MG - Manual (Page 45)

Muscle Pumps
3-2
Relief Valve and TPM Test
When the relief valve is not in operation, maintain
a setting above the normal operating pressure.
1. Set up to pump from the onboard water tank
with the discharge valve back to the water tank
open less than 1/2 way. See the procedures in
Section 2 for assistance.
2. Bring the pump pressure up to 150 PSI (10
BAR) per normal operating procedures.
3. Turn the control valve handwheel counterclockwise
until the relief valve opens and the pilot light is lit.
Master pressure gauge should drop at least 5 to 10
PSI (0.5 to 1 BAR).
4. Turn the control valve handwheel clockwise
then counterclockwise a few times to ensure that
the handwheel turns freely. Master pressure
gauge should increase and pilot light should go
out. This action also ensures proper valve
operation.
5. Reset the relief valve to its normal operational
setting.
Governor Test
If your apparatus is equipped with an electronic
governor, follow the manufacturer’s instructions
for weekly preventive maintenance.
Transfer Valve Test (Two Stage Pumps Only)
1. For manual transfer valves:
a. With the apparatus engine turned off, turn
the handwheel between the volume and
pressure positions a few times to verify
that the valve operates freely.
b. Set the truck up for pumping per the
procedure in Section 2, with the transfer
valve in the volume position.
c. Leave the engine at idle speed, and move
the transfer valve to the pressure position.
d. Verify that the discharge pressure gauge
readings have approximately doubled.
2. For power transfer valves:
a. With the apparatus engine turned off, use
either a 3/8-inch socket on the indicator
hex nut or a rod in the hole in the indicator
hex nut to manually transfer the valve to
verify that the valve operates freely.
b. Set the truck up for pumping per the
procedures in Section 2, with the transfer
valve in the volume position. Note the
discharge gauge readings.
c. Leave the engine at idle speed, and move
the transfer valve to the pressure position.
d. Verify that the master intake gauge
readings have approximately doubled.
Priming System Test
1. Tighten all pump caps, and close all pump
valves.
2. Pull the primer control while you watch for a
below-zero reading on the master intake gauge.
3. Verify that the master intake gauge readings
hold for approximately 5 minutes after you
release the primer control. A drop of 10 inches
hg in this 5 minute period is anticipated per
NFPA 1901.
Pump Shift Warning Indicator Lights
BE SURE THAT THE PARKING BRAKE IS SET
AND EVERYONE IS CLEAR OF THE TRUCK
BEFORE SHIFTING TO THE PUMP POSITION.
THE WHEELS MUST BE BLOCKED TO
PREVENT ANY MOVEMENT OF THE TRUCK.
1. Follow the operating procedures in Section 2 to
engage the pump.