Atlas Copco Products

Bulroc HD Series Shock Absorbers
for use with 2" to 6" Hammers

	Component Parts
	Reference	Description
	1	Top Connector
	2	Seal O'Ring
	3	Splined Nut
	4	Splined Nut Seal
	5	Retainer Ring
	6	Bottom Connector
	7	Thrust Guide
	8	Buffer
	9	Thrust Guide 'O' Ring
	10	Retainer Ring 'O' Ring

Basic Maintenance Instructions:

All Bulroc HD range of Shock Absorbers should be dismantled and the components inspected every 500 hours of operation or every 6 months of intermittent operation.

First, unscrew the Top Connector by locking the Bottom Connector either in a vice or with a suitable spanner against a solid base, depending on the size of the Shock Absorber, and splitting the Top Connector at the spanner flats on the Splined Nut. Remove and inspect the Buffers. If either of these is showing any signs of wear or fatigue, they must be replaced. Slide the Splined Nut off the Top Connector and examine the Nut 'O' Ring and also the Seal. Again, if any sign of wear or fatigue they must be replaced.

Important:

It is inevitable that there will be progressive wear between the Top Connector shaft and the Splined Nut. When this wear pattern exceeds .08 inches in either component, it is recommended that this component be replaced since excessive wear will eventually lead to failure of the Top Connector shaft or thread, with consequent loss of hammer and bit.

Clean all the components and apply good quality grease to the splines of the Top Connector shaft together with the splines of the Nut.

Assemble the Shock Absorber by first placing the Nut over the Top Connector and then ensure that the Thrust Guide, Retaining Rings, and Buffers are all in line.

Now place the Bottom Connector over the Nut and tighten down fully.

Bulroc HD Series Shock Absorbers
for use with Larger Hammers

	Component Parts
	Reference	Description
	1	Top Connector
	2	Buffer
	3	Thrust Washer
	4	Nut
	5	Shaft
	6	Shaft O' Ring
	7	Bottom Connector

Maintenance Instructions for 8" and 10" Shock Absorbers:

All Bulroc HD range of Shock Absorbers should be dismantled and the components inspected every 500 hours of operation or every 6 months of intermittent operation.

First, unscrew the Top Connector from the Bottom Connector by locking the Bottom Connector with a suitable spanner against a solid base and split the Top Connector at the spanner flats.

Remove and inspect the Buffer. If this is showing any signs of wear or fatigue, it must be replaced.

Now unscrew the Splined Nut from the Bottom Connector and remove the Shaft, inspect the 'O' Ring and replace if necessary.

Important:

It is inevitable that there will be progressive wear between the Bottom Connector shaft and the Nut. When this wear pattern exceeds .08 inches in either component, it is recommended that this component be replaced since excessive wear will eventually lead to failure of the Bottom Connector shaft or thread, with consequent loss of hammer and bit.

Clean all the components and then coat the splines on both the Shaft and the Nut with good quality grease.

Now, lower the Nut and shaft into the Bottom Connector and tighten the Nut down. Then put the Thrust Washer over the Shaft so it sits on the Nut face, slide the Buffer down the Shaft up to the Washer face. Grease the internal top connector thread and screw down onto the Shaft. Using suitable spanners, torque up fully.

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