Manitowoc Grove GRT9165, Руководство по обслуживанию

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2-59
GROVE
GRT9165 SERVICE MANUAL HYDRAULIC SYSTEM
2
Published 10-01-2020 Control # 699-00
Load Sense Relief (Max System Pressure)
Use the following procedure to check and set the load sense
relief pressure.
1. With the engine off, install pressure check diagnostic
quick disconnect, such as the Parker PD240 or
equivalent, with gauge onto the GP gauge port on the
Main Directional Control Valve (Figure 2-26).
2. If the lift cylinder is not attached, make sure the hoses
are capped.
3. The ODM/RDM override switch needs to be activated to
do lift up and lift down functions if the hoses are attached
to the cylinder to make sure that cylinder can reach full
stroke in either direction. Make sure the machine is
parked on a firm level surface, the park brake is set, the
boom is fully retracted and positioned over the side
away from the cab or engine cover.
4. Lift Up: Start engine and idle. Feather into the lift up
function until full cylinder stroke is achieved and hold.
Slowly accelerate the engine to full RPM. The reading at
GP should the value cited in Table 2-3. If it is not, adjust
the LS relief (Figure 2-26) “in” to increase or “out” to
decrease until the reading is achieved.
5. If the pressure cannot be achieved, ensure each piston
pump’s “cut-off” max setting is correct with the following
procedure:
a. Loosen both pump’s jam nuts on the cut-off
pressure adjusting screws (Figure 2-25).
b. Turn both pumps “in” one quarter-turn at a time -
one pump a quarter turn, then the other pump a
quarter turn, repeat, etc. - until the specified LS
pressure is achieved.
c. Turn each pump “in” 1/8 of a turn and tighten the jam
nuts to lock in the screw positions.
d. Repeat step 4, taking care to turn the LS relief back
into where you started.
Telescope Extend and Retract Relief
Pressures
Use the following procedure to set the boom telescope
extend and retract relief pressures.
1. With the engine off, install pressure check diagnostic
quick disconnect (such as Parker PD240) with gauge
onto test the nipple at Port 4 of the Accessory manifold
(Figure 2-27).
2. Start the engine and navigate to the lower display menu
screen.
3. Navigate to the Lower display menu screen and select
the Emergency Mode icon (1, Figure 2-28).
The Emergency Mode Setup screen appears.
4. Use the jog dial or keypad to highlight and change the
word GELP to HELP, then select the check box. Press
OK on the keypad or press down on the jog dial.
2
1
Lower Display Menu
1 Emergency Mode Icon
2 Boom Lost Icon
FIGURE 2-28