Perkins — How to Adjust the System Relief Valve
Adjustments · Function manifold system relief valve
From a Perkins service manual covering: 404F-22, 5046D, 5606A, 804D-33, S8015-12264, S8016H-13642, S80X15-12264, S80X16H-13642, S8515-12264, S8516H-13642. Check it applies to your exact model before use.
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Before you start
- Tip-over hazard. Do not adjust the relief valve higher than specified.
- Do not start the engine; use auxiliary power.
Procedure
- Connect a 0 to 5000 psi / 0 to 350 bar pressure gauge to the diagnostic nipple (ptest) located next to the auxiliary pump.
- Simultaneously hold the auxiliary power toggle switch and the primary boom retract toggle switch with the boom fully retracted; observe the pressure.
- Locate the system relief valve on the function manifold and remove the cap.
- Adjust the internal hex socket: clockwise to increase pressure, counterclockwise to decrease.
- Install the relief valve cap.
- Repeat step 2 to confirm relief valve pressure, then remove the pressure gauge.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- System relief valve pressure, maximum 3200 psi / 221 bar
Source: Perkins service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.