Auxiliary Pressure Check
Auxiliary pressure is used to drive flow style attach-
ments. Low auxiliary pressure can produce poor per-
formance in attachments while high pressure can
cause component damage/failure in the machine or the
attachment being utilized.
Note:
Make sure charge pressure is set correctly prior to
testing this function.
1.
Tilt the cab as described on page 4-2 of this
manual to access the valve.
2.
Locate the test port on the top of the lift arm con-
trol valve. (fig. 17-5)
3.
Attach the 0-1000psi hydraulic gauge to test port
(B) on the top of the valve. Route the gauge so
that you or an assistant can read the gauge while
performing the test procedures. (figure 17-5, 17-6)
4.
Start the machine and with the auxiliary hydraulic
switch off (no functions activated) and the engine
at idle, you should read 218 psi at test port (B).
5.
Attach the 0-6000psi gauge to test port B, then
activate the low or high flow auxiliary hydraulics
with no auxiliary attachment fastened to the quick
couplers. This action will send oil over relief and
you will read the actual pressures required to acti-
vate the relief valve for each circuit. Do this for
both the high and low flow circuits in both direc-
tions. Record the pressure readings.
Check your readings against those stated below. If
your readings differ, an adjustment and or repair may
be required.
Pressures should read: (at test port B)
•
218 +/- 10 PSI with system relaxed
(standby)
.
•
3000 +/- 100 PSI with Low Flow activated.
•
3000 +/- 100 PSI with High Flow activated.
6.
If necessary, adjust the relief settings on the auxil-
iary standby or high pressure valves. (figure 17-7)
To adjust:
a)
Remove the cap covering the affected relief
valve.
b)
Using an allen wrench, turn the adjustment
screw clockwise to increase the setting or
counter-clock wise to reduce it until within
specification.
17-3
Rubber Track Loader
17. Hydraulic Pressure & Flow
Required Tools
Pressure Gauges 0-1000, 0-6000 p.s.i.
17-5
17-6
Test Port (B)
17-7
Standby
High Pressure
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