Stanley Black & Decker GR29 user manual Operation, Preoperation Procedures

OPERATION

PREOPERATION PROCEDURES

CHECK THE POWER SOURCE

1.Using a calibrated flowmeter and pressure gauge, check that the hydraulic power source develops a flow of 4-12 gpm/15-45 lpm at 950-2000 psi/67-140 bar.

2.Make certain that 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 THE TOOL

1.Make sure all tool accessories are correctly in- stalled. Failure to install tool 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.

2.Check that the trigger is set to disengage the grinder when released.

CHECK HANDLE

Check that the cross handle is securely screwed into the handle bracket. Remove any oil from the handle.

CHECK AND ADJUST WHEEL GUARD

1.Inspect the wheel guard for cracks and other struc- tural damage.

2.If necessary, adjust the position of the wheel guard by loosening the two capscrews on the guard clamp. Make sure the capscrews are tightened securely af- ter adjustment.

INSTALLING AND REMOVING GRINDING WHEEL

1.Remove and set aside the jam nut from the output shaft.

2.Position the grinding wheel over the shaft.

3.Screw the jam nut down onto the spindle shaft. Tighten the nut securely by using two open-end wrenches, one wrench on the flats of the spindle shaft, the other wrench on the jam nut.

4.Remove the grinding wheel by loosening the jam nut as in Step 3.

IMPORTANT

Never over-tighten the grinding wheel jam nut by impacting either wrench with a mallet or hammer. Sufficient torque is attained by hand-tightening the nut with two open-end wrenches.

USE OF DEPRESSED-CENTER WHEEL ADAPTER

The Depressed-Center Wheel Adapter (part number 05194) must be used with wheels having a cupped or depressed center.

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 tool fittings or quick disconnects. It is good practice to connect return hoses first and discon- nect them last to minimize or avoid trapped pressure within the tool.

3.Observe the arrow on the couplers to ensure that the flow is in the proper direction. The female cou- pler on the tool is the inlet (pressure) coupler.

4.Move the hydraulic circuit control valve to the “ON” position to operate the tool.

5.Squeeze the grinder trigger momentarily. If the grinder does not operate, the hoses might be re- versed. Verify correct connection of the hoses be- fore continuing.

NOTE:

If uncoupled hoses are left in the sun, pressure in- crease inside the hose may make them difficult to connect. Whenever possible, connect the free ends of the hoses together.

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