ASV SC50 Scout, Руководство по обслуживанию и ремонту

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Drive Pressure Check
This procedure should only be performed if you suspect
a drive pump or drive motor is faulty. The procedure is
difficult and in performing it, you risk contaminating
your hydraulic system if your equipment and working
environment is not clean.
Make certain all couplers, fittings and hoses used during
this process are clean and free of contaminants that may
potentially cause damage to the hydraulic pump and or
system components!
Drive pressure is used to turn the drive motors that
power your tracks. Low pressure can cause decreased
drive motor performance resulting in sluggish maneu-
vering, decreased speed and or uneven forward or
reverse motion.
1. Disconnect the drive hoses at the pump. Cap and
plug all openings as shown to allow for the pres-
sure check to be performed and to keep contami-
nants out of the disconnected hoses. (fig. 14-8)
2. Remove the plug from the port you would like to
test and insert a quick coupler similar to the one in
the charge pressure test port. (fig. 14-10)
Note: There are 4 drive pump test ports. The forward (upper)
test ports are shown in figure 14-10 and the reverse (lower)
test ports are located similarly near the lower drive ports.
3. Attach the hydraulic gauge to the port(s) you are
trying to test and route the gauge so you or an
assistant can read the gauge during testing.
4. If tapped into an upper port, depress the direction-
al control pedal in an attempt to drive the machine
forward . This will force oil over relief and give you
a reading for the circuit you are tapped into.
5. If tapped into a lower port, depress the directional
control pedal in an attempt to drive the machine in
reverse . This will force oil over relief and give you
a reading for the circuit you are tapped into.
6. Check all four ports in this same manner and
record your readings.
Check your readings against that stated below. If your
readings differ, relief replacement and or component
repair may be required.
Pressures should read:
•
5500 PSI when the relief is reached in attempted
forward or reverse motion.
Drive pressure troubleshooting:
7.
If one reading is low, swap the relief valve with a
similar one and recheck. If the reading improves,
replace the faulty relief valve.
8. If two readings are low, but on different circuits
(pumps), perform step 7 for both.
9. If both readings are low on one circuit (pump), that
portion of the tandem pump is most likely at fault.
10. If all 4 readings are low, it is unlikely that all four
relief valves are faulty. Both tandem pumps are
most likely not working properly.
14-10
14-9
Test Ports
(see note)
Relief Valves
Required Tools
Pressure Gauge 0-6000 p.s.i.
!WARNING!
14-4
Rubber Track Utility Vehicle
14. Hydraulic Pressure Test & Troubleshooting
14-8
Disconnect & Cap
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