Epiroc Secoroc COP 32 User Manual

15
Wear limits
Component Wear limit Action Comments
Drill bit (diameter). Min. 6–10 mm (COP 34 4–7
mm) greater than the max.
diam. of the cylinder.
Fit new bit. Min. measurement at lower working pressures.
Max. measurement at higher working pressure.
Driver chuck (diameter). Never less than the diameter
of the cylinder.
Replace. Failure to replace in good time will cause severe
wear to hammer cylinder.
Cylinder (diameter). COP 44 – min. 89 mm
COP 54/54Qm – min. 111 mm
COP 64/64qm – min. 132 mm
Replace. Measure the diameter along the full length of the
cylinder, with the exception of the outermost 100
mm at each end. Risk of fracture.
Bit bushing (inside diameter). COP 64 max. 87,6 mm Replace. Measure the bit bushing at its waist.
Piston / Cylinder. Diametric clearance:
max. 0,20 mm
Replace worn
parts.
Outside diameter of piston should be measured at
the sealing surface of the piston.
Piston / Control tube. Diametric clearance:
max. 0,20 mm
Replace worn
parts.
Inside diam. of the piston against outside diam. of
the control tube.
Check valve. Valve seat worn or damaged. Replace worn or
damaged parts.
Tightness of check valve can be tested by pouring a
small amount of oil into the valve with the hammer
in vertical position.
Sleeve (flushing valve). Worn or damaged. Replace.
Buffer. Worn or damaged. Replace.
Trouble shooting
Fault Cause Remedy
Impact mechanism does
not operate, or works with
reduced effect.
Air supply throttled or blocked. Check the air pressure. Check that all air passages leading to
the hammer are open.
Oil is not reaching the impact mechanism
of the hammer. Poor or no lubrication,
causing increased wear, scoring or seizure.
Let operating air blow through rotation spindle on dry
plank or similar. After a few moments, plank surface should
become oily. Inspect lubricator. Top-up with oil if necessary
or increase lube oil dosage.
Too large clearance (wear) between the
piston and cylinder, or between piston and
control tube.
Disassemble the hammer and inspect the wear (see ”Wear
limits”). Replace worn parts.
Hammer clogged with dirt. Disassemble the hammer and wash all components.
Compression ring worn or damaged. Check clearance between top sub and cylinder. (See
”Checking the clearance between the top sub and cylinder”,
page 10) Replace worn or damaged compression ring.
Worn buffer rings in the cover. Disassemble the hammer and replace the buffer rings.
O-rings in bit bushing (COP 64) are worn or
damaged.
Disassemble the hammer and replace the O-rings.
Dirt enters the hammer when drilling in
water-bearing formation.
Make sure the check valve seals against the seat in the top
sub (see ”Dirt in hammer”, page 9). Remove the top sub and
replace check valve.
Lost drill bit and chuck Impact mechanism has been operated
without rotation to the right.
Fish out the lost equipment using a fishing tool. Remember
to always use right-hand rotation, both when drilling and
when lifting the drill string.
Excessive air
consumption
Flushing valve parts damaged.
Foot valve worn or damaged.
Disassemble and replace damaged parts, see page 7.
Replace foot valve, see page 12.
Overhauling
DTH hammers should be overhauled at suitable intervals depending on the drilling conditions and empirical service records. Since the
abrasiveness of the rock has a considerable bearing on the rate of wear, it will affect the overhauling intervals accordingly. Before the DTH
hammer is sent to an authorized Epiroc service workshop for overhauling, the joints at the top sub and driver chuck should be ”cracked” on
the rig.

Epiroc Secoroc COP 32 Specifications

General

Brand	Epiroc
Model	Secoroc COP 32
Category	Industrial Equipment
Language	English