Great-plains P13307 User Manual download pdf (Page 32)

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Operating Instructions

32

5. Servicing and Maintenance

5.9 Hydraulics

A low oil flow should be used, i.e.,

tractor tickover or low flow

selected.

The wing circuit is controlled by an

overcentre valve contained within

the manifold block which positively

locks oil flow until pressurised by

the tractor. System pressure can

be retained in the circuit even after

depressurisation of the tractor

quick release couplings.

Exercise extreme care when

checking the valve or circuits, and

under no circumstances attempt

to adjust or loosen fittings without

prior reference to your authorised

simba dealer, and detailed

maintenance instructions.

5.9.1 Drawbar & Axle

Phasing

The following procedure allows a greater

degree of control when raising/lowering and

levelling the machine (front to rear). For

minimum heat build up in hydraulic fittings

(due to raised oil temperatures through the

restricted fittings) the tractor flow rate should

be set in it’s lowest setting.

The restrictor A in Fig. 5.05 can be used

to slow oil from the drawbar cylinder when

raising the machine.

The restrictor B in Fig. 5.05 can be used

to slow oil from the axle cylinder when

lowering the machine.

A combination of the restriction instructions

above should be used to raise and lower

approximately parallel to the ground.

Fig. 5.05: Drawbar & Axle Phasing

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 43 44

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