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Revision B December 2013
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2. Repair procedure
a. There are two possible causes for lack of pressure.
[1] The adjusting screw has backed up.
[2] Debris or “dirt” is trapped between the seat and the ball or cone.
b. Repair as follows:
[1]
Using a pressure gauge teed into the pressure line turn the adjusting screw
clockwise a turn or two and watch the gauge; if it goes up, continue to turn the
screw until the required setting is reached. If the screw does not remain in the
correct position replace it with one that has a locking pin. (In an emergency the
screw threads may be deformed slightly with a small prick punch and hammer to
hold the setting.)
[2]
If the pressure does not climb when the adjusting screw is tightened: Turn
the adjusting screw counterclockwise all the way out; energize the pump to
''flush'' the dirt past the seat.
Caution:
Use hand or a piece of hose to divert oil into a container. Do not
look into the port.
Inspect the cone or ball for nicks and replace if necessary; re-seat the ball or
cone using a small drift punch and hammer with a light tap; re-assemble spring
and screw and reset the pressure.
Note:
In an emergency, if a pressure gauge is not available, turn the relief valve screw in
until the cylinder moves under worst conditions and then tighten 1/2 to 3/4 additional
turn.
[3]
If the above mentioned procedure fails to increase the relief valve setting,
check for a worn pump or leaking cylinder. (See Pump and Cylinder sections)
Note: Avoid the use of
Teflon
®
tape on hydraulic fittings as it can easily clog valves and
filters in the system.
