Great Plains SLD600 Operator Manual - Manual (Page 32)

32 Simba SLD
602-227M-ENG
2013-02-05
5.9 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 0-20 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
following procedure should be followed (an
assistant will be required):
1 First locate the manifold block; it is
located at the front of the Simba SLD
chassis above the drawbar.
2 Locate the valve on the top face of
the block (A) and undo the lock nut.
Using a 4mm allen key turn the valve
all the way clockwise then turn it
anticlockwise 2 full turns.
3 Locate valve C on the block; undo the
lock nut and turn the valve all the way
clockwise.
4 Locate valve B, undo the lock nut and
turn the valve all the way anticlockwise.
5 Start the tractor and put the spool that
controls the tines into the float position.
Both the gauges will go to zero and the
tines will go down. This indicates that
the system is depressurised.
6 Now get someone to pressure the tines
down. Whilst they are being pressured
down, turn valve B on the block slowly
clockwise. The pressure on the upper
gauge will start to rise. Turn the valve
until you reach approximately 80 to 90
bar (the pressure on the lower gauge
will now be reading approximately 10
to 15 bar). Lock off all the valves. The
tine circuit is now set.
Fig. 5.05: Pro-Lift Tine Hydraulic Manifold
5. Servicing and Maintenance
A
B
C