The lift relief valve pressure test should be performed to
make sure that the lift circuit relief pressure is correct.
The relief pressure for both raise and lower is the same.
9. After relief pressure is obtained, return the tow ve-
hicle lift lever to the neutral position and stop the tow ve-
hicle engine. Record relief pressure.
Procedure for Raise/Lower Relief Valve Pressure
Test
10.If measured relief pressure is incorrect, relieve hy-
draulic system pressure (see Relieving Hydraulic Sys-
tem Pressure in the General Information section of this
chapter) and remove relief valve on lift relief manifold
(Fig. 16). Clean or replace relief valve (see Lift Relief
ManifoldintheService andRepairs sectionofthischap-
ter). Also, if relief pressure is low, consider a problem
with the tow vehicle hydraulic system. Internal lift cylin-
der leakage could also cause low circuit pressure.
1.
perature by operating the machine for approximately 10
minutes.
Make sure hydraulic oil is at normal operating tem-
2.
Have ProCore Processor attached to tow vehicle
and park machines on a level surface. Engage tow ve-
hicle parking brake, stop engine and remove key from
the ignition switch. Make sure that Processor engine is
off. Chock wheels to prevent movement of either ma-
chine.
NOTE: Adjustment of lift relief valves is NOT recom-
mended.
11.
After testing is completed, make sure that tow ve-
3.
lynch pin to prevent lift axle from shifting.
Secure Processor lift axle to frame with hitch pin and
hicle engine is stopped, then relieve hydraulic system
pressure (see Relieving Hydraulic System Pressure in
the General Information section of this chapter). Re-
move pressure gauge and connect hydraulic couplers.
Remove lynch pin and hitch pin from lift axle before us-
ing ProCore Processor.
4.
tion.
Read Precautions For Hydraulic Testing in this sec-
CAUTION
2
1
2
Before opening hydraulic system, operate all hy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
Relieving Hydraulic System Pressure in the Gen-
eral Information section of this chapter.
4
3
5
5.
ThoroughlycleanProCoreProcessorhydraulichose
quick couplers atthe junction to the tow vehicle. Discon-
nect hydraulic hose quick coupler for the direction (raise
or lower) to be tested (Fig. 15). Connect a T--connector
and 5000 PSI (350 bar) pressure gauge between the
disconnected Processor hose and tow vehicle outlet
coupler.
Figure 15
1.
2.
3.
Quick coupler
4.
5.
Hose to manifold port B
Hose to manifold port A
90o hydraulic fitting
Cable tie
6.
After installing pressure gauge, start tow vehicle en-
gine and run atidle speed. Check for any hydraulic leak-
age from test connections and correct before
proceeding with test.
3
UP
7.
Move tow vehicle throttle to full speed.
1
IMPORTANT: While performing this test, hold tow
vehicleliftleverinthe raise/lowerposition onlylong
enough to get a relief pressure reading. Holding the
lever in the raise/lower position for an extended pe-
riod may damage system components.
20 ft--lb
(27.1 N--m)
8.
Move tow vehicle lift lever in the direction being
2
tested to pressurize lift circuit. While holding lever,
watch pressure gauge carefully. As the lift relief valve
lifts, system pressure should be:
Figure 16
1.
2.
Lift relief manifold
Raise relief valve (RV1)
3.
Lower relief valve (RV2)
Approximately 1100 PSI (76 bar)
ProCore Processor
Page 4 -- 19
Hydraulic System
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