Troubleshooting

If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem.

When diagnosing faults in operation of the grinder, always check that the hydraulic power source is supplying the correct hydraulic flow and pressure to the grinder as listed in the table. Use a flowmeter known to be accurate. Check the flow with the hydraulic oil temperature at least 80 °F/27 °C.

Problem	Cause	Solution
Grinder does not run.	Hydraulic power source not	Check power source for proper flow
	functioning.	and pressure (7–10 gpm/26–38 lpm @
		1500–2000 psi/105–140 bar.
	Couplers or hoses blocked.	Locate and remove restriction.
	Hydraulic motor failure.	Inspect and repair.
	Hydraulic lines not connected.	Connect lines.
Grinder operates too slow.	Hydraulic motor speed to slow.	Check power unit for proper flow (7–10
		gpm/26–38 lpm).
	High back-pressure.	Check hydraulic system for excessive
		back-pressure (over 250 psi/17 bar).
	Couplers or hoses blocked.	Locate and remove restriction.
	Oil too hot (above 140 °F/60 °C)	Check hydraulic power source for
	or too cold (below 60 °F/16 °C).	proper oil temperature. Bypass
		cooler to warm oil or provide cooler to
		maintain proper temperature.
	Relief valve set too low.	Adjust relief valve to 2200–2300
		psi/152–159 bar.
	Hydraulic motor worn.	Inspect, repair or replace.
	Flow control malfunctioning.	Have flow control serviced at an
		authorized Stanley service center.
Grinder operates too fast.	Flow control malfunctioning.	Have flow control and valve body
		serviced at an authorized Stanley
		service center.
Spindle rotates in the wrong	Hydraulic flow is in the wrong	Connect the pressure line to the
direction.	direction.	grinder port marked IN. Connect the
		return line to the grinder port marked
		OUT.

HG60 User Manual ◄ 13

TROUBLESHOOTING

Problem

Cause

Solution