Great-plains P13307 User Manual download pdf (Page 33)

33Solo

Operating Instructions

5. Servicing and Maintenance

5.9.2 Pro-Lift Trip-Reset

Tine Hydraulics

The circuit allows for the tines to be

pressurised down into work, whereupon a

relief valve limits this applied tractor down

pressure to a value less than the main system

accumulator (80b x 2 litre). This allows tines

to trip in work, the oil being absorbed by the

main accumulator. A secondary (rod side)

accumulator ensures this side of the cylinder

is maintained full of oil to minimise cavitation

and seal damage. A pre charge valve restricts

return rod side oil flow to the tractor as the

tines are pressurised down to ensure this

secondary circuit is charged.

In operation, oil is locked in the cylinder circuit

at a pressure determined by the relief valves

90-120 bar full bore side and 20 to 60 bar

rod side. This occurs at all times, even with

the circuit in float at the tractor, provided the

tines are fully down. For extremely stony

conditions, adjust the valve to read 90 bar on

the gauge as the tines are pressured down.

For heavy soils with little stone where

compaction is present it is possible to

increase this pressure to 120 bar.

If the tine circuit should need setting the fol-

lowing procedure should be followed (an as-

sistant will be required):

1 First locate the manifold block; it is lo-

cated on the left hand side of the ma-

chine attached to the main chassis, just

behind the wing that supports the trip

reset tines.

2 With the valve block directly in front of

you, undo the lock nut on the valve on

the top face of the block. Using a 4mm

allen key turn the valve all the way clock-

wise, then turn it anticlockwise 2 full

turns.

3 Locate the valve on the front face of the

block (the one facing the rear of the trac-

tor) and undo the lock nut then turn the

valve all the way clockwise.

4 Locate the valve on the rear face of the

block (facing the rear of the machine)

and undo the lock nut then turn the valve

all the way anticlockwise.

5 Start the tractor and put the spool lever

that controls the tines in to the float po-

sition. Both the gauges will go to zero

and the tines will go down. This indi-

cates that system is depressurised.

6 Now get your assistant to pressure the

tines down. Whilst they are being pres-

sured down, turn the valve on the rear

face of the block slowly clockwise. The

pressure on the lower gauge will start

to rise. Turn the valve until you reach

approximately 80 to 90 bar (the pres-

sure on the upper gauge will now be

reading approximately 10 to 15 bar).

Lock off all the valves. The tine circuit

is now set.

Fig. 5.06: Pro-Lift Tine Hydraulic Manifold

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