Hilti WSJ 850, WSJ 750 operating instructions Troubleshooting, Fault Possible cause Remedy

9. Troubleshooting

Fault	Possible cause		Remedy
The saw blade drops out.	The saw blade is not engaged correctly. Reinsert the saw blade, taking care to
			ensure that the blade holder is fully open
			and the saw blade is pushed in against the
			resistance felt.
				en
		The blade clamping mechanism is	Clean the blade holder.
	dirty.
The saw blade cannot be	The blade clamping mechanism is		Clean the blade holder.
inserted.	dirty.
The tool cannot be	The supply cord is not plugged in.		Check that the supply cord is plugged in.
switched on.	The switch is defective or dirty.		Clean the exterior of the switch with a
			cloth or have the switch checked by a
			trained electrical specialist.

The switch cannot be lock- The switch is defective or dirty. ed in the sustained running

position (WSJ 750-ET and 850-ET)

Clean the exterior of the switch with a cloth or have the switch checked by a trained electrical specialist.

The orbital action cannot	The tool is dirty.	Clean and remove foreign matter from
be adjusted.		the slot for the orbital action adjustment
		lever.
No orbital action.	The tool is dirty.	Check the area of the orbital action fork
		and remove any dirt or foreign matter.
	The orbital action adjustment lever	Set the lever to the desired position.
	is set to the "0" position.

Speed cannot be adjusted. The stroke rate adjustment thumb- wheel is dirty or defective.

Clean the exterior of the thumbwheel or have the tool checked by a trained electrical specialist.

Speed too high or too low.	The wrong stroke rate is set.		Check the stroke rate setting
			(scale on the thumbwheel) and adjust it
			accordingly.
Dust removal with the	The dust removal hood is not fitted.		Check that the vacuum cleaner is working
vacuum cleaner or dust			and that the dust removal adaptor and
removal module doesn’t			dust removal hood are fitted.
work.		The passages in the tool and / or dust	Clean the passages in the tool or dust
	removal adapter are dirty or blocked.		removal adapter.
The baseplate cannot be	The securing screw has not been		Check the screw and release it if neces-
pivoted.	released or the connection between		sary. Clean the area between the baseplate
	the baseplate and the tool is dirty.		and the tool.
An accessory cannot	The point of attachment to the base-		Clean the point of attachment to the base-
be fitted (WSJ 850-ET/-EB)	plate is dirty or the wrong accessory		plate and check whether a suitable acces-
	is being used.		sory is being used.
The dust removal module	The module is not correctly attached		Check that the module is correctly
doesn’t function.	to the tool.		attached to the tool.
	The dust container is full.		Empty the dust container.
	The filter is dirty.		Clean the filter or fit a new dust container.
The cut is not straight.	The blade is unsuitable for the		Use the saw blade recommended by Hilti
	application.		for the application you are carrying out.
	The blade is blunt or damaged.		Use a suitable, new saw blade.
The material being cut	Stroke rate and cutting force is too		Reduce the stroke rate and apply less
overheats.	high.		pressure.
The material being cut	Inadequate lubrication when cutting		Use a new saw blade and ensure adequate
overheats (metal).		metal.	lubricant is applied between the saw blade
			and workpiece.

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