Grove
Published 01-14-2021 Control # 707-01
2-53
TMS9000-2 SERVICE MANUAL
HYDRAULIC SYSTEM
2
the nipple at GPPS port of the Accessory manifold. See
(Figure 2-15).
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.
Feather into lift up or down and hold. (If the cylinder is
fully stroked in either direction the RCL over-ride switch
will need to be active to assure that the pilot supply will
not be cut off before the cylinder can be dead headed)
The reading at GPPS should be 600 ± 50 PSI (41± 4
bar) if it is not adjust the pilot supply pressure reducing
valve. See (Figure 2-15) “in” to increase or “out” to
decrease until the reading is achieved.
5.
Stop engine. Remove diagnostic couplers.
C. Procedure for Checking/Setting the Main
Directional Control Valve, Load Sense, Lift
and Telescope Pressures
Load Sense Relief (Max System Pressure)
1.
With the engine off, install pressure check diagnostic
quick disconnect (Parker PD240) with gauge onto the
test nipple at GP gauge port on Main Directional Valve
(MDV). See (Figure 2-13).
2.
If the lift cylinder is not attached assure the hoses are
capped and move to Step 3.
3.
The RCL override switch will need to be activated to do
lift up and lift down functions if the hoses are attached to
the cylinder in order to assure 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 be 4300 ±50 PSI (296 ±4 bar) if it is not adjust
the LS relief (see Figure 2-13) “in” to increase or “out” to
decrease until the reading is achieved.
NOTE:
If the pressure can not be achieved assure the
piston pump “cut-off” max setting is correct by
loosening the jam nut on the cut-off pressure
adjusting screw (see Figure 2-14) and turn it “in”
until it softly seats or bottoms out. Then back the
adjusting screw “out” ½ turn and lock in place with
the jam nut. Perform this step on both pumps. Then
repeat Step 4.
Lift Down Relief Pressures
1.
With the engine off, install pressure check diagnostic
quick disconnect (Parker PD240) with gauge onto test
the nipple at GPLS port of the Accessory manifold. See
(Figure 2-15).
2.
If the lift cylinder is not attached assure the hoses are
capped and move to Step 3.
FIGURE 2-32
9266
Tele fill relief
Pilot supply
reducing valve
Pressure reducing
valve
GPLS
GPPS
Fo
r
Reference
Only
