Grizzly G0647 Limit Rings, Hydraulic Fluid Pressure, To reset the position of the limit rings

limit rings

Limit Rings

When the limit stops are secured up against the limit rings, the ram and beam move at their maxi- mum safe lengths to either side. The position of the limit rings (refer to Page 33) have been set at the factory and should not be moved.

However, if the machine makes a noticeable unex- pected noise just before the beam reverses direc- tion, the limit rings and stops may be positioned beyond the maximum safe position and will need to be reset. This process is one of trial-and-error and will require time and patience to successfully complete.

Tools Needed	Qty
Hex Wrench 4mm	1
Wrench 10mm	1
To reset the position of the limit rings:

1.Press the emergency stop button in to pre- vent unexpected movement of the beam.

2.Remove the limit stop assembly access panel from the front of the machine.

3.Loosen the set screws on the limit rings, then move and secure them all the way to the outer edges of the limit bar.

4.Center the limit stops on the limit bar and separate them approximately 2", then secure them in place.

5.Set the controls to Normal, stand clear of the machine, reset the emergency stop button, then use the pedal actuator to test the limit stop settings in both directions (Punch and Notch).

—If there are no unexpected noises or prob- lems as the beam moves through the stroke and stops, then the setting is opera- tional. Continue to Step 6.

—If there is an unexpected noise as the beam reverses direction, the position of the limit stop is not correct. Move the limit stop slightly toward the center, then repeat this step.

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hydraulic fluid pressure

6.After successful tests in each direction, move the limit stops just slightly further apart, and repeat Step 5 until the tests are no longer successful.

7.Move the limit stops to the last successful positions—this is the safe outside setting for the limit stops.

8.Fully secure the limit stops, move the limit rings up to the stops, then secure the limit rings in place.

9.Re-install the limit stop access panel before beginning operations.

Hydraulic Fluid

Pressure

If the hydraulic fluid reaches beyond 3000 PSI, the pressure relief valve protects the hydraulic system by redirecting the fluid from the cylinder back into the reservoir. Generally the only time this should occur is when attempting a cutting operation that is beyond the capacity of your machine.

The pressure relief valve is calibrated at the fac- tory and should not require change. However, if necessary, contact a qualified hydraulic service technician to load test the hydraulic system and re-calibrate the pressure relief valve (see Figure 66).

Needle

Valve

Pressure

Relief

Valve

Figure 66. Hydraulic pressure relief and needle

valves.

G0646/G0647 50/65 Ton Ironworker