GR60 User Manual ◄ 11
PREOPERATION PROCEDURES
Each unit as shipped has no special unpacking or as-
sembly requirements prior to usage. Inspection to as-
sure the unit was not damaged in shipping and does
not contain packing debris is all that is required. After
installation of a grinding wheel a unit may be put to use.
CHECK HYDRAULIC POWER SOURCE
1. Using a calibrated owmeter and pressure gauge,
check that the hydraulic power source develops a ow
of 7-10 gpm/26-38 lpm at 1500-2000 psi/105-140 bar.
2. Make certain the hydraulic power source is equipped
with a relief valve set to open at 2100-2250 psi/145-155
bar minimum.
3. Check that the hydraulic circuit matches the tool for
open-center (OC) or closed-center (CC) operation.
CHECK TOOL
1. Make sure all tool accessories are correctly installed.
Failure to install tool accessories properly can result in
damage to the tool or personal injury.
2. There should be no signs of leaks.
3. The tool should be clean, with all ttings and fasten-
ers tight.
CHECK TRIGGER MECHANISM
1. Check that the trigger operates smoothly and is free
to travel between the “ON” and “OFF” positions.
CHECK GUARD ASSEMBLY
1. Inspect the wheel guard assembly for cracks and
other structural damage.
INSTALLING AND REMOVING GRINDING WHEELS
READ AND BECOME FAMILIAR WITH THE SECTIONS
IN THIS MANUAL ON SAFETY PRECAUTIONS, TOOL
STICKERS AND TAGS, HYDRAULIC HOSE REQUIRE-
MENTS, HYDRAULIC REQUIREMENTS, AND PRE-
OPERATION PROCEDURES BEFORE USING THIS
PRODUCT.
NOTE:
Use 6-inch diameter up to 3-inch thick (Type 6 for USA/
Type 36 for CE) grinding wheels with a 5/8-11 threaded
arbor hole. Only use grinding wheels which comply with
ANSI B7.5/ISO 525, 603.
1. Depress the push lock (6) and screw the grinding
wheel onto the main shaft (13) and tighten using a strap
wrench.
2. Adjust guard to desired height.
CONNECT HOSES
1. Wipe all hose couplers with a clean lint-free cloth
before making connections.
2. Connect the hoses from the hydraulic power source
to the hose couplers on the grinder. It is a good practice
to connect the return hose rst and disconnect it last to
minimize or avoid trapped pressure within the grinder
motor.
3. Observe ow indicators stamped on hose couplers
to be sure that oil will ow in the proper direction. The
female coupler is the inlet coupler.
NOTE:
The pressure increase in uncoupled hoses left in the sun
may result in making them difcult to connect. When
possible, connect the free ends of operating hoses to-
gether.
OPERATING PROCEDURES
1. Observe all safety precautions.
2. Always start the grinder with the grinding wheel away
from the work surface.
3. Move the hydraulic circuit control valve to the “ON”
position.
Never over-tighten the grinding wheel by impacting
the wrench with a mallet or hammer. Sufcient torque
is attained by hand-tightening the wheel with a strap
wrench or for wheels secured with capscrews, hand
tightening with a socket wrench while depressing the
push lock.
OPERATION
