22
DROPNOSE RAM
Is fitted with two O/C valves. You have two
things you can try to help you to decide which
component has failed :
First remove all hoses (take care) so you can
see where oil is escaping
• If the oil is escaping from the full bore side
the full bore O/C valve is the problem.
• Slowly open the adjusting screw for the O/C
relief valve on the annular side. The piston
seals have failed if oil starts to come out
from the annular side and the cylinder is
starting to close up at an increased speed,
replace the piston seals
OUTRIGGER RAM
Is fitted with two check valves. They have no
adjustment.
If the outrigger is not holding under load it is
most likely that the check valve for the full bore
side is leaking.
The check valves are difficult to get to as the
block is well protected from falling objects by
being tucked well away on the underside of
the ram. You have to remove the rod pin from
the outrigger when the outrigger is retracted.
You can now swing down the outrigger to free
the cylinder.
Both check valves are identical. You can swap
them over to see if the cylinder stop moving.
Remember the • full bore check ensures that
the outrigger stays down when you are up in
the air working. The annular • side check
ensures that the outrigger remains vertical
when you are towing the machine down the
road.
The • restrictor is critical to prevent the
outrigger juddering when raising the outrigger
to the transport position. Do not replace with a
non restricted hose adapter.
Dropnose cylinder with welded on block
containing two adjustable O/C valves
Outrigger cylinder with welded on block
containing the two check valves. The
restrictor shown is the hose adapter fitted
in the outrigger control valve
MAINTENANCE PROCEDURE
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