HYDRAULIC SYSTEM GRT9165 SERVICE MANUAL
2-52
Published 10-01-2020 Control # 699-00
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 2-3 Hydraulic Valve Pressure Settings
VALVE TO BE SET
GAUGE
PRESSURE
PSI (bar)
TOLERANCE
PSI (bar)
PROCEDURE
Pump No. 1 differential pressure
550
(38)
±25 (2)
Checking/Setting the Piston Pumps Cut-off
and Differential Pressures, page 2-54.
Pump No. 2 differential pressure
500
(34.5)
±25 (2)
Checking/Setting the Piston Pumps Cut-off
and Differential Pressures, page 2-54.
Pilot supply pressure 450 (31) ±50 (4)
Checking/Setting the Pilot Supply
Pressure, page 2-56.
Load Sense (max system) pressure 4350 (300) ±50 (4)
Load Sense Relief (Max System
Pressure), page 2-59.
Telescope Retract Pressure 3250 (224) ±100 (7)
Telescope Extend and Retract Relief
Pressures, page 2-59.
Telescope Extend Pressure
2900
(200)
±100 (7)
Telescope Extend and Retract Relief
Pressures, page 2-59.
Swing left and right pressures 2900 (200) ±100 (7)
Checking / Setting the Swing Brake
Release Pressure, page 2-60.
Swing brake release pressure
260-300
(18-21)
See range
Checking the Swing Work Pressure, page
2-61.
Cab Tilt Pressure 3100 (214) ±100 (7)
Checking/Setting Cab Tilt Raise and
Lower Pressures, page 2-63.
Counterweight Lower Pressure 1450 (100) ±100 (7)
Checking/Setting Counterweight and
Hydraulic Boom Extension Pressures,
page 2-63.
Counterweight Raise Pressure 3200 (221) ±100 (7)
Checking/Setting Counterweight and
Hydraulic Boom Extension Pressures,
page 2-63.
Counterweight Pin Pressure 2600 (179) ±50 (4)
Checking/Setting Counterweight and
Hydraulic Boom Extension Pressures,
page 2-63.
Outrigger Beam Extend Pressure 1200 (83) ±50 (4)
Checking/Setting Outrigger Pressure,
Rear Steer, and Suspension Raise, page
2-65.
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