ASV PT-70, Service Manual

Page: 132 / 146

1. Attach the gauge to test port A. (fig. 17-1) Route
the gauge so that you or an assistant can read it
during testing.
2. Make sure any bystanders are clear of moving
components, then start the engine.
3. Allow the engine to warm up to operating tempera-
ture, then with the engine at idle, check the charge
pressure. Record your reading. It should read 475
+/- 30 psi at this test port. If your reading differs,
adjustment is necessary.
4. If necessary, adjust the charge relief pressure.
To adjust:
a)
Tilt the cab as described on page 4-2 of this
manual to access the pump.
b) Locate the charge relief valve on the top of the
drive pump. (fig. 17-2)
c) Remove the relief valve from the top of the
pump as shown in figure 17-3.
d) Add shims to increase the pressure setting, or
remove shims to decrease the setting until
within specification. (figure 17-4)
5. Retest once adjustments have been made to make
sure pressure is correct. Readjust as necessary
until correct.
17-2
Rubber Track Loader
17. Hydraulic Pressure & Flow
17-2
17-4
17-3
Charge Relief