GR30 User Manual ◄ 13
5. Check the tool for oil leaks. If leaks are observed,
do not use the tool; have the equipment serviced
before use.
IMPORTANT
Check the speed of the motor output shaft after
every 100 hours of operation.
HYDRAULIC POWER SOURCE CHECK
1. Connect the hydraulic hoses in accordance with the
instructions for Hydraulic Hose Connection. Wipe
all hose couplers with a clean, lint-free cloth before
making connections. Dirty couplers can contami-
nate the hydraulic circuit and prevent a good seal at
the connection.
2. Using a calibrated owmeter and pressure gauge,
check the hydraulic power source at the tool’s input
port. Make sure the system provides the following
ow requirements:
a. Operating ow of 7–9 gpm / 26–34 lpm
b. At 2000 psi/140 bar pressure
The hydraulic uid temperature should be at least
80 °F/27 °C for this test. Refer to the Hydraulic Sys-
tem Requirements section for more information.
3. Make sure the hydraulic power source has a relief
valve set at a minimum of 2100 psi/145 bar.
4. Check the tool and hydraulic system for proper op-
eration and performance. If the equipment does not
appear to operate properly, have it serviced before
use.
COLD WEATHER OPERATION
IMPORTANT
Use an oil with the recommended specications
listed. Using oil that is too viscous (thick) can
damage the hydraulic system or tool.
Before using the tool in cold weather, preheat the hy-
draulic uid by operating the power unit at a low speed.
The oil should be at or above 50 °F/10 °C with a viscos-
ity of 400 SSU/82 cs before operating the tool.
OPEN CENTER/ CLOSED CENTER SETUP
(OC/CC)
This tool can be congured to run on both open center
and closed center systems. Set for proper system be-
fore use.
1. Determine system type.
2. Remove hex plug (78) from spring cap using a 3/16
in. hex.
CLOSED CENTER: Using a 3/16 in. Hex, reach
through the hole in the spring cap and turn the selec-
tor screw fully clockwise. When the selector screw
bottoms, closed center operation is selected.
OPEN CENTER: Using a 3/16 in. Hex, reach through
the hole in the spring cap and turn the selector screw
counter-clockwise until meeting resistance (from the
retaining ring). Turn the selector clockwise and then
counter-clockwise to be sure the selector is being
stopped by the retaining ring. Do not force the selec-
tor screw. Open center Operation is now selected.
3. Reinstall hex plug. Failure to install plug may intro-
duce contaminants to the spool bore resulting in re-
placement of the valve spool and main housing.
CAUTION
To prevent damage to the retaining ring, do not
attempt to force the selector screw counter-clockwise
beyond the point of initial resistance.
TOOL OPERATION
WARNING
Improper operation of this tool can cause severe
personal injury, death, or equipment damage.
Read the safety guidelines and instructions in this
manual before operating the tool.
Observe all safety precautions when operating the tool.
Read the Safety and the HTMA Requirements sections
before operating the tool for the rst time. Failure to do
so can result in severe eye injury or injury to other parts
of the body.
OPERATION