September 2012
Page 13
PFM Portable Hydraulic Testers PFM6, PFM6BD, and PFM8
Pump Test
A tee must be installed between the pump discharge port and the return line to the tank Be sure the fluid path is only
through the pump, the hydraulic test unit, and back to the tank
TANK
OPEN LOAD VALVE BEFORE
STARTING MACHINERY.
INDICATES DISPLAY
OVER RANGE.
DO NOT STAND IN FRONT OF
PRESSURE RELIEF DISK VENT.
Flo-check
PFM
by HEDLAND
RACINE, WI. USA
FLOW
TEMP
O
FF
TEE
PUMP
RELIEF
VALVE
Flo-check
PFM
OUT
IN
Figure 4: Pump Test
1 Plug the line to the control valve
2 Open the tester loading valve fully to read maximum pump flow at zero pressure
3 Close the loading valve to increase pressure from zero pressure to rated or maximum pump pressure to determine
pump condition
4 The pump flow at rated pressure can now be checked against the pump manufacturer’s specifications A decrease
in flow from zero pressure to maximum pressure indicates the pump condition A pump that delivers a constant low
flow at zero pressure and at maximum pressure suggests suction problems