Table of Contents
Advertisement
15. Increase engine speed to full throttle and per-
form the following:
a. Hoist up to full extension, hold for 10 sec-
onds, then allow cylinders to float down.
16. Return hoist control to Neutral.
17. Shut down engine and turn key switch OFF.
Allow at least 90 seconds for the accumulator to
bleed down.
18. Reconnect hoist limit solenoid in brake cabinet.
19. Close both hoist pump suction line shut-off
valves. Close steering pump suction line shut-
off valve.
20. Remove hoist & steering filter elements. Clean
housings and install new elements.
21. Open all (three) suction line shut-off valves.
Bleed all air from pump suction lines and steer-
ing pump before starting engine. Refer to Pump
Pressure Setting, Section L for air bleeding pro-
cedure.
22. Check hydraulic oil in tank is visible in upper
sight gauge. Add oil if necessary.
L10028
OIL CLEANLINESS CHECK
To check the hydraulic system for contaminants or
debris, a high quality particle counter is required.
1. Shut down engine, turn key switch OFF and
allow accumulator to completely bleed down
before opening circuits to take measurements,
to make repairs, or to install or remove gauges.
2. If the hydraulic system had been contaminated,
clean the affected components and the hydrau-
lic tank.
3. Perform the hydraulic system flushing proce-
dure.
4. Perform the hydraulic system checkout proce-
dure to insure all components are operating cor-
rectly.
5. Connect the particle counter to the test fitting on
either hoist filter.
NOTE: Do not connect the device to the steering
filter test fitting. The oil does not circulate through the
steering system as quickly as the hoist system.
6. Operate the truck for at least 10 minutes at high
idle. Do not operate the steering, hoist, brakes
or any other hydraulic function during this entire
procedure.
7. Take particle count readings for at least 20 min-
utes without changing the engine speed.
8. When the particle count level is at or below ISO
18/15 and showing a trend of improving cleanli-
ness, or maintaining ISO 18/15 or better, then
the hydraulic system is clean and the truck can
return to service.
9. After hydraulic oil meets cleanliness level, shut
down engine, turn key switch OFF and allow
accumulator to completely bleed down.
10. Check hydraulic oil in tank is visible in upper
sight gauge. Add oil if necessary.
Hydraulic Check-out Procedure
L10-23
Advertisement
Chapters
Table of Contents
