Manitowoc Grove GRT9165, Service Manual

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HYDRAULIC SYSTEM GRT9165 SERVICE MANUAL
2-56 Published 10-01-2020 Control # 699-00
Checking/Setting the Pilot Supply Pressure
Use the following procedure to check and set the pressure
for the pilot supply pressure.
NOTE: Make sure the outrigger box pressure bleed off
valve is shut before checking the cut-off and
differential settings. For more information, see the
Operator Manual .
1. With the engine off, install pressure check diagnostic
quick disconnect (Parker PD240 or equivalent) with
gauge onto test the nipple at GP4 port of the Accessory
manifold (Figure 2-26).
2. If the lift cylinder is not installed, plug the lift hoses. If the
cylinder is installed, omit this step.
3. Start engine and idle.
4. Gradually increase to raise or lower and hold. (If the
cylinder is fully stroked in either direction the RCL
override switch will need to be active to assure that the
pilot supply will not be cut off before the cylinder can be
fully extended) The reading at GP4 should be the value
cited in Table 2-3. If it is not, adjust the pilot supply
pressure reducing valve (see Figure 2-27) “in” to
increase or “out” to decrease until the reading is
achieved.
5. Stop the engine. Remove the diagnostic couplers.
FIGURE 2-25
10137
Piston Pumps
1 Piston Pump 1
2 Piston Pump 2
3 Cut-off Pressure Adjustment Screw
4
Differential (Standby) Pressure
Adjustment Screw
1
2
3
3
4
4
View Looking Up
Front
8.0 mm
(0.32 in)
±0.5 mm
(±0.02 in)
Cut-Off Screw
Adjustments
Jam Nut
10138