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HYDRAULIC SAFETY
BE CAREFUL OF:
1. Leaks
a. Puddles of uid are slippery and hazardous.
b. Most hydraulic oils will vaporize and ignite,
disastrous res are possible.
c. Leaking uid may be hot and can produce severe
burns.
d. Fluid can squirt out under high pressure with
dangerous force. Pin hole jets can pierce skin and
damage eyes.
WARNING: Escaping fluid under pressure can
penetrate the skin, causing serious personal injury�
Relieve pressure before disconnecting hydraulic or
other lines� Tighten all connections before
applying pressure� Use a piece of cardboard or
paper to search for leaks� Never use your hand! If
any fluid is injected into the skin, it must be
surgically removed within a few hours by a doctor
familiar with this type of injury or gangrene may
result�
2. Hot Components
a. Pumps and motors.
b. Relief valves.
c. Anyplace uid has been owing.
CAUTION: Always wear safety goggles or safety
glasses during maintenance�
3. Stored energy - Even with the power unit off, there
may be energy stored in the system due to:
a. Stalled feed wheels.
b. Suspended loads, booms and stabilizers.
c. Charged accumulators.
d. Electrical voltage.
NOTE: Never boost pressure settings on hydraulics. This will
void the manufacturer's warranty.
A hydraulic pump makes oil ow but there must be resistance
for the ow to generate pressure. If a motor or a cylinder
does not work or works slowly, the uid must be slipping
through it or bypassing the work completely. Trace the lines
to the
motor or the cylinder, then place a pressure check on the
working line.
When the pump is working at the proper gallons per minute
(GPM) and the pressure checks out OK, you will nd that in
most cases your motor or your cylinder is defective.
If the pressure is too low, the pump or the relief valve is
causing the difculties. Clean relief valve thoroughly.
Reassemble relief valve and check the pressure again.
Example: If the pump is pumping six gallons in 30 seconds
and the pump is a 12 GPM, then you know that it is
performing at capacity. If it will only pump two or three GPM
in 30 seconds, you know that the pump is only performing at
50% of its capacity. If the pump is performing properly, the re-
lief valve is defective. If the pump isn't performing right, it will
need repairing or replacement. When the pump is pumping at
the proper GPM and the pressure is correct, you will nd that
in most cases, your hydraulic motor or cylinder is defective.
FILTERS
The lters mounted on the hydraulic tank are 10 micron
absolute and should not be replaced with any lter not
meeting or exceeding this rating.
UNDERSTANDING HYDRAULICS
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