19
Platform Controls
Is identical to the ground control apart from the extra valve bank needed to control the
slewing basket ram. The orifice in the Basket slew fitting is there to prevent the basket
turning too quickly.
Hand Pump
Enables you to lower and operate the slew in case of emergency. The pump is fed from
the general return line. It is theoretically possible to extend the cylinder with the hand
pump but the force required is excessive and the fixing bracket for the hand pump is not
designed to take such a load. If no resistance is felt when operating the hand pump try to
operate the basket slew or the drop nose to prime the pump.
Basket Slew
Cylinder has no lock valve. It relies on the closed centre of the spool to prevent it moving.
All Other Boom Cylinders
Have lock valves fitted to prevent uncontrolled movement in case of hose failure.
Stabiliser Control Valve
In the centre position, this block has the B port connected to the tank. This is to ensure
that the outrigger cylinder check valve closes quickly when setting up the machine. The 4
restrictors shown are there to prevent cylinder juddering caused by the check valves fitted
to the outrigger cylinders.
MAINTENANCE PROCEDURE
To Next Page
Loading...
