80
Service
Training
Danfoss Backhoe Control Valve
End Module
The control valve module of the backhoe control valve houses the following valves:
1. Inlet compensator spool - 175-230 PSI (12-16 bar).
2. Full flow main relief valve - 3250 PSI (225 bar) @ 1800 rpm.
3. Pilot valve for main relief valve - 3250 PSI (225 bar) @ 1800 rpm.
4. Return line back pressure valve – 500-725 PSI (35-50 bar).
Back pressure fully removed when pressure in the pressure gallery is 1160-1450 PSI (80-100 bar).
5. Pilot supply valve – 175 – 230 PSI (12 – 16 bar).
6. Pilot supply valve safety valve – 265 PSI (18 bar).
4 Spool Monoblock
This controls the following functions:
Slew. Contained within the slew circuit are two relief valves set at 3500 PSI (240 Bar), two anti-cavitation
valves, a compensated check valve in the pressure gallery and a load sense valve.
Boom. Contained within the boom circuit are two relief valves set at 3500 PSI (240 Bar), (piston side) 4500
PSI (310 Bar)(rod side), two anti-cavitation valves, a check valve in the pressure gallery and a load sense
valve.
Dipperstick. Contained within the dipper circuit are two relief valves set at 4000 PSI (265 Bar) (piston side)
4200 PSI (280 Bar) (rod side), two anti-cavitation valves, a check valve in the pressure gallery and a load
sense valve.
Bucket. Contained within the bucket circuit are two shock valves set at 4200 PSI (280 Bar), two anti-cavitation
valves, a check valve in the pressure gallery and a load sense valve.
Note: All shock valves are factory set and none adjustable.
3 Spool Monoblock
On both electronic and mechanical machines the 3-spool valve is mechanically operated.
This contains the following functions:
Left hand Stabilizer. Contained within this circuit are a check valve and a load sense valve in the pressure
gallery. No shock valves are fitted.
Right hand Stabilizer. Contained within this circuit are a check valve and a load sense valve in the pressure
gallery. No shock valves are fitted.
Auxiliary (Dipper Extend/Retract and Hammer). Contained within this circuit are two relief valves set at 2300
PSI (190 Bar), two anti-cavitation valves, a compensated check valve in the pressure gallery and a load sense
valve.
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