Atlas Copco SECOROC COP 64.3 Podręcznik - Strona 10

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1. Technical Data

to the drill bit after grinding

or replacing a drill bit, its

radial location on the bit

shank should be advanced

by one spline section. This

will give a more even dis-

tribution of wear on the

driver chuck and hammer

cylinder.

If the driver chuck is

exposed to exceptionnally

heavy wear, e.g. when

drilling in rock formations

with a high quartz content (granite, quartzite etc.), it may be necessary

to turn the driver chuck by more than one spline section in order to

prevent the driver chuck and hammer cylinder from wearing out too

quickly. As a rule, the cuttings grooves in the bit should always be

pointing towards the part of the driver chuck that is least worn.

Since the hammer cylinder has three thread inlets, the part of the

driver chuck that is worn the most can be located against the part of

the hammer that is worn the least.

Checking the wear of the driver chuck and

hammer cylinder

Wear to the driver chuck and hammer cylinder should be checked

regularly, e.g. every time the bit is reground or changed. Measure

the diameter of the hammer cylinder using a sliding calliper. Measure

along the full length of the cylinder, with the exception of the outermost

100 mm at each end. At any point between these points, the diameter

of the hammer cylinder must not be less than the mini mum permis-

sible diameter given for the respective DTH hammer sizes in the table

below.

Minimum permissible diameter

COP 34

78 mm

COP 44

89 mm

COP 54

111 mm

COP 64.2

132 mm

COP 64.3

130 mm

COP 84.2L

148 mm

COP 84

164 mm

The outside diameter of the driver chuck must not be less than that

of the hammer cylinder.

N.B. When the hammer cylinder has to be changed, the driver chuck

must be replaced at the same time (see the section "Wear limits").

The hammer should be overhauled at suitable inter vals, depending

on the operating con ditions. The abrasiveness of the rock will affect

the overhauling intervals, since it has a strong bearing on the rate

of wear.

Shimming

Checking the clearance between

the top sub and the cylinder

N.B. Not applicable on COP 64.2, COP 64.3

and COP 84.2L.

When ﬁ tting the top sub to the hammer,

the clearance between the top sub and the

cylinder must be checked with a feeler gauge. This is done as follows:

Remove the valve body D and compression ring B from the cylin-

der.

Remove the control tube G and buffer housing H from the cylinder,

using a rod.

Remove the outer buffer K from the control tube, (the inner buffer

J should not be removed).

Smear the O-ring on buffer housing H and the inner buffer J with

silicone grease. Oil all other surfaces of the control tube G with oil.

Fit the buffer housing H and control tube G back into cylinder.

Fit the compression ring B and valve body D back into the cylinder.

Remove the O-ring E from the top sub F.

Thread the top sub into the cylinder and tighten it by hand.

Clearance before/after shimming

Ordering No.

shims (1–4)

COP 34

3161-1322-00

COP 44

3161-1422-00

COP 54

3161-1522-00

COP 84

3161-1822-00

Measure the clearance between the top sub and cylinder.

If the clearance is less than the minimum value given in the table,

shimming must be carried out.

Fit the necessary number of shims C (1 – 4 pcs) between the com-

pression ring B and valve body D.

If, after the maximum number of shims (4 pcs) has been inserted, the

minimum clearance is still less than the value shown in the table, then

the compression ring or circlip is worn out and must be replaced.

After inspection and eventual shimming, smear the outer rubber

buffer K with silicone grease and ﬁ t it back into the cylinder together

with the control tube G and buffer housing H.

Then ﬁ t all other parts back into cylinder.

N.B. Do not forget O-ring E — ﬁ rst smear it with silicone grease and

then ﬁ t it back on to the top sub.

Finally, smear the threads of the top sub with Atlas Copco thread

grease, and thread it into the cylinder. Tighten hard with the aid of a

wrench. There should now be hardly any clearance between the top

sub and cylinder.

Buffer rings (J, K) for COP 34/64.2/64.3/84.2L/84

IMPORTANT!

The buffer rings must be

mounted with their concave

(curved) sur faces towards the

control tube ﬂ ange. Incor-

rectly ﬁ tted buffer rings can

cause serious damage to the

hammer.

Assembly of the drill bit and driver chuck

Smear the splines of the bit shank with Atlas Copco thread

grease.

Smear the O-ring of the stop

ring with silicone grease.

Assemble the bit 1, driver

chuck 2 and stop ring 3 as shown

in ﬁ gure.

IMPORTANT!

Make sure the stop ring is located

correctly, and that it faces the

right direction. Incorrect ﬁ tting

will result in severe damage to

the hammer.

Smear the thread on the driver chuck with

Atlas Copco thread grease.

Screw in the bit assembly by hand. Note that there should be a

clearance of 0.1–0.4 mm between the driver chuck and the cylinder

casing. If there is no clearance, the end surface of the cylinder casing

should be ground down as necessary. Tighten the driver chuck with

the aid of the bit spanner.

Min.

Clearance

clearance

after shimming

1,3 mm

1,7 – 2,3 mm

1,5 mm

1,9 – 2,5 mm

1,8 mm

2,2 – 3,0 mm

2,5 mm

3,0 – 4,0 mm