jcb Mini CX - Page 192

Section E - Hydraulics
Operation Description
Transmission Pump Operation - Series 2 Machines
E-22 E-22
9803-9340-8
Directional Control Valve (DCA)
Pilot pressure is fed to the DCA 3 from the DA control
valve. Forward or reverse selection energises the
appropriate solenoid 3a or 3b, causing spool movement.
Pilot pressure oil is directed to the corresponding end of
the swash control piston.
High Pressure relief Valve and Control
Pressure Make-up Valve (HPRV)
The HPRVs 5 have three functions:
1 To protect the pump and motor high pressure circuit.
2 To function as boost (make-up) inlet valves.
3 To provide a bypass facility to enable towing of a
disabled machine (see Towing/Winching, this
Section).
449830-C1
Fig 16.
449850-C1
Fig 17.
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