System check/relief (SCR) valves
The SCR valve is a high pressure relief valve and a system check valve in combination. Whenever an SCR
valve has been replaced or opened, the pump should be operated in its full range of functions to ensure
proper machine operation. The SCR valves are pre-set at the factory, no adjustment is possible. Pressure
code is marked on the valve (1103). Refer to the model code for pressure designation. If SCR malfunction
is suspected, replace valve and test operation of pump.
To adjust max. system pressure, replace SCR valve with one set for the desired pressure setting.
The following procedure explains how to replace the SCR valves.
1. Shut down the system.
2. Using a 1-1/4 hex wrench, remove relief valve plug (166).
3. Remove spring (165) and relief valve (1103) from pump housing.
4. Insert new relief valve (1103) and spring (165) into pump housing.
5. Replace O-ring (106). Lubricate new O-ring before installation.
Service Manual
Series 40 M46 Tandem Variable Pumps
Adjustments
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Danfoss | September 2017 11029852 | AX00000030en-US0202 | 21
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