DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM # 10 PFC Pump Flow This test is used to determine the oil flow of the PFC pump. When conducting this test, the flowmeter should read 151 l/m (40 gpm). If the reading is less than 143 l/m (38 gpm) there could be a problem with the PFC pump.
Test Procedure Drain all hydraulic oil from the reservoir. Disconnect and cap the outlet line from the PFC pump. Attach the inlet hose for the flowmeter to the outlet of the PFC pump. Next, attach the outlet hose for the flowmeter to the line that was removed from the PFC pump.
Disconnect and cap the signal line. Tee a hose into the inlet hose of the flowmeter and connect it to the compensator. Refill the reservoir with Hy-Tran Ultra. With the flowmeter restriction valve fully open, start the engine. Move throttle to high idle position and adjust restriction valve to produce a 138 bar (2000 psi) restriction. The flowmeter should read specification. If the reading is under specification the PFC pump could be damaged. NOTE: The most common reason for low flow from a PFC pump is NOT due to pump failure, BUT a mis-adjusted or malfunctioning flow control spool in the compensator.
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