Downstroking of the pump 1

Load control valve (55)

The load control valve for the lift cylinder is fitted in the pressure oil supply lines, between the lift section (29) and the lift extension cylinder (54). The valve prevents any load movement in the event of hose bursts or leakage. If the valve is defective, a complete new cartridge must be fitted.

The load control valve is factory set and should never be dismantled or adjusted except for resealing.

Key to Load Control Valve

1. From the lift section (29) 2. Lift cylinder (rod side) 3. Lift cylinder (full bore side) 4. From the lift section (29) 5. Pilot pressure 6. Supply pressure 7. Pressure relief

Diverter valve (56)

The diverter valve, if fitted, is attached to a bracket, which is fitted to the rear service plate, to the left side of the chassis member. The valve is connected between the 1st auxiliary section (30) and the 1st service couplings (59) and autohitch manifold (57).

The valve is solenoid operated and selected by a rocker switch in the cab. When selected, the valve diverts oil from the 1st auxiliary service to the rear of the machine where it can be utilized to operate trailer tipping or autohitch.

Specification: Solenoid Operating voltage 12V DC

Key to Diverter Valve

1 To the 1st service coupling (59) 2 To the 1st service coupling (59) 3 Autohitch manifold (57) 4. Autohitch manifold (57) 5-10.Not used 11. To the 1st auxiliary section (30) 12. To the 1st auxiliary section (30)

Manifold (57)

The manifold is attached to the rear service plate and is located between the autohitch cylinder (58) and the diverter valve (56). The manifold is used to deliver oil to the autohitch or trailer tipping services.

Autohitch cylinder (58)

The autohitch cylinder, if fitted, is located on the rear of the machine and is used to automatically connect and lift a trailer onto the machine. The pressure oil supplies to the autohitch cylinder are from the autohitch manifold (57).

Specification

Stroke 325 mm Bore 60 mm

1st service couplings (59). The 1st service couplings (not illustrated) are of the quick-release type and are used to attach hydraulic services to the front of the machine.

2nd service couplings (60)

The 2nd service couplings are of the quick-release type and, if fitted, are used to attach a second hydraulic attachment to the front of the machine.

Trailer tipping connection (61)

The trailer tipping connection (not illustrated) is of the quick-release coupling type and, if fitted, connects hydraulic supplies to the trailer tipping service.

Start-up valve (62)

The start-up valve is fitted in the hydraulic supply line between the LS hydraulic pump (2) and the control valve PVSP inlet section (36). An internal spring valve opens the start-up valve to divert fluid to the hydraulic tank (1) when the engine is being started, offloading the build-up of pressure. When the LS hydraulic pump builds up sufficient pressure, the fluid pressure overcomes the spring valve, which closes and prevents fluid from flowing back to the hydraulic tank (1).

Non-return valve (63)

(Up to Machine S/No.51200317 only) This is a simple non-return valve, which maintains system pressure for the parking brake circuit, in the event of hydraulic or engine failure.

Pressure relief valve (64)

(Up to Machine S/No.51200471 only)

The cartridge pressure relief valve is attached to the cooling fan motor (7) and relieves excess pressure in the hydraulic fluid supply to the motor. The valve relieves pressure by diverting hydraulic fluid flow to the hydraulic tank (1).

Specifications

Pressure relief valve 160 bar (2320 psi)

Breather (70)

The breather is fitted to the overflow line from the filler neck to tank return and ensures that the hydraulic tank is vented. This prevents any build up of positive or negative air pressure inside the tank, which would cause damage to the tank or restrict fluid flow.