HGL User
Manual ◄ 11
PRE-OPERATION PROCEDURES
CHECK HYDRAULIC POWER SOURCE
1.
Using a calibrated flowmeter and pressure gauge,
check that the hydraulic power source develops a
flow 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 in-
stalled. 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 fittings 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 (if equiped) for
cracks and other structural damage. Do not operate
if damaged.
INSTALLING AND REMOVING GRINDING
WHEELS
READ AND BECOME FAMILIAR WITH THE SEC
-
TIONS IN THIS MANUAL ON SAFETY PRECAU-
TIONS, TOOL STICKERS AND TAGS, HYDRAULIC
HOSE REQUIREMENTS, HYDRAULIC REQUIRE
-
MENTS, AND PRE-OPERATION PROCEDURES BE
-
FORE USING THIS PRODUCT.
NOTE:
On HGL80/81 use 8 inch by 1 inch thick (Type 1)
grinding wheels with a 5/8 arbor hole. Only use
grinding wheels which comply with ANSI B7.1/ISO
525, 603.
1.
Loosen 3 capscrews (item 1, page 18) and remove
the guard front plate (item 20, page 18) and set
aside.
2.
Depress the push lock (item 12, page 21) to lock
the spindle. Unscrew the jam nut (item 4, page 18).
Remove the outside flange (item 8, page 18).
3.
Make sure blotters or labels remain on the grind-
ing wheel. Install the grinding wheel onto the spindle
(item 15, page 21) and reinstall the outside flange
and jam nut.
4.
Depress the push lock and tighten the jam nut. Only
tighten sufficiently to prevent slippage of the wheel
between the flanges.
5.
Reinstall the guard front plate and capscrews.
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 prac
-
tice to connect the return hose first and disconnect
it last to minimize or avoid trapped pressure within
the grinder motor.
3.
Observe flow indicators stamped on hose couplers
to be sure that oil will flow 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 difficult to connect.
When possible, connect the free ends of operating
hoses together.
OPERATING PROCEDURES
1. Observe all safety precautions.
2.
Always start the grinder with the grinding wheel or
cone away from the work surface and have both
hands on the grinder at all times.
3. Move the hydraulic circuit control valve to the
ON
position.
4.
Squeeze the trigger momentarily. If the grinder does
not operate, the hoses might be reversed. Verify
correct connection of the hoses before continuing.
5.
Start the grinder and move the grinding wheel or
cone to the work surface.
6. Grind a small amount of material at a time.
COLD WEATHER OPERATION
If the grinder is to be used during cold weather, preheat
the hydraulic fluid at low engine speed. When using the
normally recommended fluids, fluid temperature should
be at or above 50 °F/10 °C (400 ssu/82 centistokes) be-
fore use.
OPERATION