Stanley Black & Decker MB656 user manual Troubleshooting, Problem Cause Solution

TROUBLESHOOTING

This section describes how to find and resolve problems users may experience. If a situation occurs that is not covered, call your Stanley Customer Service represen- tative for assistance.

WARNING

Inspecting the tool or installing parts with the hydraulic hoses connected can result in severe personal injury or equipment damage. To prevent accidental startup, disconnect the hydraulic power before beginning any inspection or installation task.

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 tool, always check that the hydraulic power source is supplying the correct hydraulic flow and pressure to the tool as listed in the table below. Use a flowmeter known to be accu- rate. Check the flow with the hydraulic oil temperature at least 80 °F/27 °C.

PROBLEM	CAUSE	SOLUTION
Breaker will not fire.	Low hydraulic oil level.	Fill reservoir.
	No flow to breaker.	Have hydraulic circuit tested by
	Main relief set low.	authorized dealer/distributor per
		approved procedure.
	Internal damage.	Have unit serviced by an authorized
		dealer/distributor.
	Damaged quick couplers.	Replace.
Breaker runs slowly.	Low hydraulic flow	Have hydraulic circuit tested by an
	Excessive heat build up.	authorized dealer/distributor per
		approved procedure.
	Excessive nitrogen pressure.	Have unit serviced by an authorized
		dealer/distributor.
	Internal leakage.
Breaker runs erratically.	Low or excessive back-pressure.	Have carrier serviced by an authorized
		dealer/distributor.
	Damaged switch or connection.
	Relief set too low.
	Internal damage.
	Tool binding.	Add grease to tool shank. Do not pry
		while operating.
Breaker runs but at reduced	Low accumulator charge.	Have unit serviced by an authorized
power.	Excessive back-pressure.	dealer/distributor.
	Relief set too low.
Breaker leaks oil around tool bit	Lower seals failed.	Have unit serviced by an authorized
and tool bushing.		dealer/distributor.
Hydraulic system overheats.	Main relief set low.	Have unit serviced by an authorized
		dealer/distributor.
	Insufficient cooling capability in
	hydraulic circuit.
	Line/hose size too small.
	Excessive back-pressure.

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