Page 18 September 2012
PFM Portable Hydraulic Testers PFM6, PFM6BD, and PFM8
MAINTENANCE / TROUBLESHOOTING
The PFM testers are designed to give years of trouble-free service. However, if trouble is suspected, a few simple checks can be
made.
Load Valve
If the valve fails to load the system, remove the valve body and check for foreign material, worn parts or seals.
Flow
The absence of any flow reading may indicate a blockage of the turbine. Remove the retaining ring from the inlet port and
carefully remove the turbine assembly. Remove any material that may be preventing easy rotation of the rotor.
Reassemble and attempt a flow reading again. If the tester still fails to indicate flow, it is recommended to return the tester to
the factory. For return procedures, see the Return Goods Authorization section of the manual.
Burst Discs and Burst Disc Bodies
The burst discs are designed to rupture at a specified pressure. The PFM6 and PFM8 testers have a single burst disc that by-
passes flow around the loading valve when ruptured. The PFM6BD testers provide protection from excessive pressure in either
direction with two internal burst discs that when ruptured by-pass flow around the loading valve. If rupture occurs, the burst
discs must be replaced.
WARNING
Warning - If you do not have the proper tools to accomplish this task, it is highly recommended that you return the
tester(s) to the factory for replacement of the burst disc housing and the burst discs. Injury to personnel and/or dam-
age to equipment may result if the burst discs are installed improperly.
The following tools and parts will be needed:1
⁄” open end box wrench
0-80 (or greater) pound-inch torque wrench
Burst discs
PFM6 - P.N. F1614-7500 (1 each)
PFM6BD - P.N. F1614-7500 (2 each)
PFM8 - P.N. F1614-7500 (1 each)
Optional
O-Ring - P.N. F3137-015 (1 each)
Backup Ring - P.N. F1015-015 (1 each)
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