HYDRAULIC SYSTEM GRT8100 SERVICE MANUAL
2-36
Published 3/26/2018, Control # 596-05
Checking/Setting the Outriggers, Rear Steer,
and Hydraulic Transmission Oil Cooler Fan
Motor Pressures
1. With the engine off, install a pressure check diagnostic
coupler (9999101806) with gauge onto the diagnostic
nipple at G2 port of the carrier combination valve (see
Figure 2-14).
2. Start engine and idle.
3. Fully retract the outrigger jacks.
4. Actuate the outrigger jack retract function and hold.
Slowly accelerate the engine to full rpm. Turn the
outriggers/rear steer/fan pressure reducing valve
integrated in the carrier combination valve (see
Figure 2-15) clockwise to increase or counter-clockwise
to decrease until a gauge pressure of 2750 ±50 psi
(190 ±4 bar) is achieved.
5. Stop engine. Remove diagnostic coupler
FIGURE 2-14
Carrier Combination Valve (bottom)
1G2 Port
2G3 Port
8804-70
2
1
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