The tree saw is equipped with a case drain line that
is to be routed to the excavator hydraulic reservoir.
It is normal for a hydraulic motor to have a slight
amount of internal leakage.
The case drain line will allow this internal leakage to
be returned to the reservoir, preventing excessive
pressure on the motor seal.
Starting with model year 2022, tree saws will be
equipped with a zero leak relief valve (A) installed
in the case drain line.
If the case drain line is not connected or becomes
obstructed, the zero leak relief valve will vent the
pressurized hydraulic fluid to the atmosphere. The
zero leak relief valve will self reset after hydraulic
pressure reduced.
^
WARNING
Pressurized fluids can penetrate the
skin�
Keep bystanders away from machine
during operation�
A tiny, almost invisible leak can penetrate
the skin, thereby requiring immediate
medical attention�
If hydraulic fluid is coming out of the zero leak relief
valve, shut down machine immediately. Inspect
the case drain line connection and lines. Contact
your dealer if case drain lines and connection are
good.
NOTICE
Environmental hazard�
Clean up any spilled hydraulic fluid
immediately�
A properly installed case drain protected by a zero
leak relief valve will save the work of replacing the
motor shaft seal and also improve the efficiency of
your hydraulic system.
A
5�6 Zero Leak Case Drain Relief Valve
22