TROUBLESHOOTING
Before any troubleshooting is attempted, become fully ac-
quainted with the following two (2) basic fundamental facts
of a hydraulic system:
1 - SPEED The speed of a hydraulic function is directly re-
lated to the system flow. A reduction in speed of a cylinder or
motor is caused by an insufficient quantity of oil being deliv-
ered to the component.
2 - POWER The power or force of a hydraulic function is re-
lated to pressure.
If an understanding of the differences between speed and
power of a hydraulic system is under- stood correctly, then
accurate troubleshooting can be accomplished in a minimum
amount of time.
NEVER resort to increasing the valve relief pressure in
an attempt to cure the ills of the system. Fully diagnose
the problem.
Hydraulic components are precision units and their continued
smooth operation depends on proper care. Therefore, do not
neglect hydraulic systems. Keep them clean and change the
oil and oil filter at established intervals.
If, in spite of these precautions, improper opera- tion does oc-
cur, the cause can generally be traced to one of the following:
1. Use of the wrong viscosity or type of oil.
2. Insufficient fluid in the system.
3. Presence of air in the system.
4. Mechanical damage or structural failure.
5. Internal or external leakage.
6. Dirt, decomposed packing, water, sludge, rust, etc., in the
system.
7. Improper adjustments.
8. Oil cooler plugged, dirty or leaking.
Whenever hydraulic, fuel, lubricating oil lines, or air lines are
to be disconnected, clean the adjacent area as well as the point
of disconnect. As soon disconnected, cap, plug or tape each
line or opening to prevent the entry of foreign material. The
same recommendations for cleaning and covering apply when
access covers or inspection plates are removed.
Clean and inspect all parts. Be sure all passages and holes are
open. Cover all parts to keep them clean. Be sure parts are
clean when they are installed. Leave new parts in their con-
tainers until ready for assembly.
Clean the preservative compound from all machined surfaces
of new parts before installing them.
HYDRAULICS - GENERAL
RT700 Series Page 5 - 2 Issued: August 2003
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