Great-plains P13307 User Manual download pdf (Page 35)

35Solo

Operating Instructions

5. Servicing and Maintenance

5.9.4 Roll Hydraulics

Tampering with a pressurised

hydraulic system is extremely

dangerous.

Pressure may be retained in the

roll circuit between the valve and

the cylinders. Although it shouldn’t

be necessary to remove the fittings

between the valve and the

cylinders, the de-pressurisation

procedure should be followed

before doing so.

De-pressurisation Procedure

for Roll Hydraulics

To de-pressurise the circuit, identify and

adjust the following valves on the roll valve

block.

All valves can be identified by stamped codes

adjacent to each valve.

1. Set tractor hydraulics to neutral,

machine lowered and unfolded.

2. Adjust Over Centre valve (1) fully

clockwise.

3. Adjust Over Centre valve (2) fully

clockwise.

4. Set main system to float, or allow oil

pressure to be released in both

directions.

The manifold may need de-

pressurising after being subjected to

high oil flow.

Roll Hydraulics Setting

Procedure - Factory settings

The following table outlines the re-setting of

the roll hydraulics back to factory settings.

Each number below corresponds to the

relevant valve on the hydraulic block located

near the roll section of the machine.

V

alve # Function Setting Procedure

1 Over Centre Valve

for locking wings

down in work

Adjust the valve all the way

out (anti-clockwise) then a

half turn in (clockwise).

2 Over Centre Valve

for holding wings

safely during

unfolding

Adjust the valve all the way

anti-clockwise then check

by unfolding the wings to a

45° angle and putting the

hydraulics into float. The

wings will now be locked.

Slowly turn the valve

clockwise until the wings

start to lower. At this point

stop the wings lowering by

slowly turning the valve anti-

clockwise. When the wings

have stopped lowering turn

the valve one full turn anti-

clockwise and lock it off.

3 Relief Valve -

Unfolding

Set to 80 bar

4 Relief Valve -

Folding

Set to 150 bar

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 43 44

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