Danfoss 51 Series Service Manual

Charge relief valve
Overview
You may use one of two charge relief valves on Series 51 and Series 51-1 motors: either poppet or
orificed. Alternatively, a defeat plug may block the charge relief valve cavity.
Poppet style (older production)
Disassembly
1. Thoroughly clean all external surfaces before disassembly.
2. Loosen the locknut (K90) using a 11/16 hex wrench.
3. Unscrew the adjustment screw (K10) from the cavity in the endcap, using a standard screwdriver, or a
13mm wrench.
4. Remove the O-ring (K50) from the adjustment screw.
5. Discard the O-ring (K50) after inspecting the new one to make certain that it fits.
6. Remove the spring (K70) and poppet (K80) from the cavity.
Inspection
1. Inspect the parts and cavity for wear or damage.
2. Clean the cavity.
Reassembly
1. Replace any damaged or worn part, making certain that you have the exact replacement parts before
discarding the worn parts.
2. Install the poppet (K80) to the cavity.
3. Install the spring (K70) to the poppet.
4. Install a new O-ring (K50) to the adjustment screw (K10).
5. Install the adjustment screw in the cavity.
6. Hand tighten the locknut (K90).
Service Manual
Series 51 and 51-1 Motors
Minor repair
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©
Danfoss | March 2016 11008567 | AX00000013en-US0202

Danfoss 51 Series Specifications

General

Brand	Danfoss
Model	51 Series
Category	Engine
Language	English