Manitowoc Grove GRT8100 Service Manual

2-23
GROVE
GRT8100 SERVICE MANUAL HYDRAULIC SYSTEM
2
Published 3/26/2018, Control # 596-05
PRESSURE SETTING PROCEDURES
The following procedures should be used to properly check,
adjust and set the hydraulic system pressures.
The following equipment is required for checking the
hydraulic pressure settings.
• Pressure Gauge (1) three dial gauge 0 to 34.5 MPa (0 to
5000 psi)
• Accumulator charging and gauging assembly for
20.7 MPa (3000 psi)
• ORFS reducers as required to attach work port hoses to
the gauge.
NOTE: When checking the directional control valve relief
settings, unless otherwise specified, start with the
engine at idle RPM and move the controller to its
fully stroked position. Then slowly accelerate the
engine to the specified rpm. Read gauge and make
adjustments to specified setting.
When checking the outrigger relief valve setting,
start with the engine at idle rpm and activate and
hold the extend or retract switch. Then slowly
accelerate the engine to the specified rpm. Read
gauge and make adjustment as required.
Table 2-2 Valve Pressure Setting Table
VALVE TO BE SET
GAUGE
PRESSURE
PSI (bar)
TOLERANCE
PSI (bar)
GAUGE PORT & ADJUSTMENT
LOCATION
Pump No. 1 differential pressure
375 to 425
(26 to 29)
See range
Gauge port on No. 1 pump; adjust
differential pressure adjustment screw
on No. 1 pump (see Figure 2-5).
Pump No. 2 differential pressure
425 to 475
(26 to 33)
See range
Gauge port on No. 2pump; adjust
differential pressure adjustment screw
on No. 2pump (see Figure 2-5).
Hoist(s) and lift pressures 4000 (276) ±100 (7)
GP port on main directional valve;
adjust at LS relief on main directional
valve (see Figure 2-6)
Telescope retract pressure 3250 (224) ±50 (4)
GP7 port on steer/brake valve (see
Figure 2-8); adjust tele retract relief on
main directional valve (see Figure 2-7)
Pilot supply pressure 600 (41) ±50 (4)
GP4 port on steer/brake valve; adjust
pressure reducing valve on steer/brake
valve (see Figure 2-9)
Front steer pressure 2800 (193) ±50 (4)
GP6 port on steer/brake valve (see
Figure 2-9); adjust relief on steer/brake
valve (see Figure 2-8)
Cab tilt, counterweight removal and
counterweight pinning pressures
2600 (179)
+50, -0
(+4, -0)
GP5 port on steer/brake valve (see
Figure 2-8); adjust pressure reducing
valve on cab tilt/cwt manifold (see
Figure 2-13)
Swing brake release pressure
260-300
(18-21)
See range
GP3 port on steer/brake valve; adjust
pressure reducing valve on steer/brake
valve (see Figure 2-9)
Swing left and right pressures
2750 to 3100
(190 to 214)
See range
GP5 port on swing directional valve
(see Figure 2-10) Non-adjustable
Service brake high charge limit 2320 (160)
-72, -145
(+5, -10)
Test nipple on brake accumulators
(see Figure 2-11) Non-adjustable
Service brake low charge limit 1950 (134) ±145 (10)
Test nipple on brake accumulators
(see Figure 2-11) Non-adjustable

Manitowoc Grove GRT8100 Specifications

General

Brand	Manitowoc
Model	Grove GRT8100
Category	Construction Equipment
Language	English