SERVICE AND ADJUSTMENTS
6 - 1
VALVE ADJUSTMENTS
Setting hydraulic pressure is a complex operation and
should be performed only after satisfying the following
conditions.
1. Warm the hydraulic oil to 130° F in normal conditions.
NOTE: If the normal hydraulic operating temperature
is substantially above or below 130° F use that value in-
stead.
2. Be sure the correct engine speed is used as the relief
valve setting will vary with the flow rate.
3. Be certain to calibrate the pressure gauge used. Gauge
calibration can be lost if the gauge is subjected to pul-
sating pressure for a few seconds. The gauge must have
a proper snubber to read center of pump pressure ripple
or erroneous readings will result.
MAINTENANCE CHECKS All the relief valve
maintenance checks are conducted an a SEMI-ANNU-
AL BASIS. Check the relief valves and make the nec-
essary adjustments by the following procedures.
The relief valves used on this hydraulic crane have a
screw type adjustment. If it is determined that the
valve is out of adjustment, follow this general adjust-
ment procedure.
NOTE: Some machines are equipped with auxiliary
winch plumbing even though an auxiliary winch is not
installed. on these machines you must follow the pro-
cedure for setting the auxiliary winch relief valve.
As the operator, it is your responsibility to detect any un-
usual, sounds, odors, or other signs of abnormal perfor-
mance that could indicate trouble ahead.
By detecting any problems in their early stages, you can
save yourself unnecessary downtime and your employer
a lot of money! Therefore, it is also your responsibility to
use good judgment in detecting failures in quickly and
repairing them. If you don’t, one failure can lead to an-
other.
Before attempting to make an adjustment yourself, ask
yourself if you have the RIGHT TOOLS, IF you have the
PROPER TEST EQUIPMENT and IF you can accurate-
ly DIAGNOSE the cause of the problem.
If you can’t answer YES to all three questions, rely on
your Distributor Serviceman. He has the right tools,
testing equipment and service knowledge to pin-point
the problem in minutes instead of the hours consumed
in hit-or-miss methods. TIME IS MONEY! He will
save it for you.
If you decide to attempt an adjustment yourself, follow
a logical TROUBLE SHOOTING PROCEDURE.
Don’t simply replace parts until the trouble is found.
Issued: August 2003RT700 Series
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