Pressure Setting Procedures - Manitowoc Grove RT770E Service Maintenance Manual

RT770E

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.
Table 2-2
Valve Pressure Setting Table
Valve To Be Set
Load Sense Relief*
Lift Down Relief
Telescope Retract Relief
Telescope Extend Relief
Hoist Raise
Hoist Lower
Pilot Pressure Supply
Swing Brake Pilot Supply
Front Steer Relief Valve
Swing "Left" Relief
Swing "Right" Relief
Outrigger/Rear Steer Relief
Service Brake
Service Brake High Charge Limit
Service Brake Low Charge Limit
Accumulator Pre-Charge
Charge Air Cooler Fan Motor Relief
Counterweight Valve
*This setting is for Boom Lift "UP" Circuit
GROVE
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.
Pressure
Tolerance
Setting
MPa (PSI)
MPa (PSI)
27.6 (4000) ±0.4 (±50)
+4.8/-0
13.8 (2000)
(+700/-0)
24.1 (3500) ±0.4 (±50)
18.6 (2700) ±0.4 (±50)
24.1 (3500) ±0.4 (±50)
24.1 (3500) ±0.4 (±50)
2.2 to 3.1 within listed
(325 to 450) range only
1.7 (250) +0.4/-0 (+50/-0)
17.2 (2500) ±0.4 (±50)
15.2 (2200) ±0.4 (±50)
15.2 (2200) ±0.4 (±50)
17.2 (2500) ±0.4 (±50)
20.7 (3000) ±0.4 (±50)
+0.5/-1.0
17.4 (2320)
(+72/-145)
13.5 (1950) ±1.0 (±145)
6.2 to 6.6 +0.4/-0
(900 to 950) (+50/-0)
6.9 (1000) +.4/-0 (+50/-0)
12.07 (1750) ±0.4 (±50)
Published 11/26/2014, Control # 447-05
HYDRAULIC SYSTEM
Adjustment Location
Main Control Valve Inlet Gauge Port
Main Control Valve Telescope Retract
Port
Main Control Valve Telescope Extend
Port
Main Control Valve Hoist Raise Port
Main Control Valve Hoist Lower Port
Main Control Valve Inlet
Pressure Reducing Valve
Swing/Steer Control Valve
Swing/Steer Control Valve
Swing/Steer Control Valve
Outrigger/Rear Steer Valve Inlet
Service Brake/CAC Fan Valve
Dual Accumulator Charge Valve
Dual Accumulator Charge Valve
Accumulator
Service Brake/CAC Fan Valve
Counterweight Valve
2
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