Loop flushing valve
1. Remove the loop flushing plug (Q050). Discard the O-ring (Q050A).
2. Remove the loop flushing spool assembly (Q051) from the housing.
3. Inspect the parts for damage or foreign material. Ensure the washer securely retains the centering
spring.
4. Install the loop flushing valve spool assembly (Q051) into its bore. Install a new O‑ring (Q050A) on the
loop flushing plug (Q050); torque to 37 N•m [27 lbf•ft].
Loop flushing relief valve
Two styles of loop flushing relief valve plugs exist. The style of plug is depends on the charge pressure
specification. If the charge pressure is greater than or equal to 18 bar [260 psi]: the plug has two
identification grooves. If the charge pressure is less than 18 bar [260 psi]: the plug has a single
identification groove.
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Minor Repair
520L0638 • Rev 0300 • July 2015 63
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