Alkin W3 Series Instruction Manual & Parts List Download

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W 3 S E R I E S
H I G H P R E S S U R E A I R C O M P R E S S O R

©ALKIN COMPRESSORS

To replace the 1st stage piston, lubricate cylinder bore and insert the connecting rod. Use an appropriate

piston ring compressor method to prevent damage to the rings when inserting, and push the piston into

the cylinder as far as possible. Next, replace the crankcase-to-cylinder gasket, after which, the cylinder,
piston and connecting rod may be replaced as a unit by inserting the connecting rod (with its oil dipper

pointing down) into the crankcase. Lubricate the piston rings and slide the 1st stage cylinder over the piston
using an appropriate piston ring compressor method to prevent damage to the rings. If the airheads have

been removed from the cylinders they must be replaced according to the procedure outlined under “air
head replacement”

To replace the 2

and 3rd stage pistons lubricate the bore of the crosshead cylinder and insert the

connecting rod and piston into it. Next replace the cylinder to frame gasket, after which the cylinder, piston
and connecting rod may be replaced as a unit by inserting the connecting rod. Next, replace the gasket

between the crosshead and compression cylinder. Lubricate the piston rings and slide the compression
cylinder over the piston using an appropriate piston ring compressor method to prevent damage to the

rings. With the compression cylinder replaced, bolt it to the crosshead cylinder. If the airhead was removed,
it is essential that it be replaced in the manner described under “air head replacement”

Replace the crankcase cover and all tubing and fittings that were removed.

Fill the crankcase to the overflow point with Anderol 750 oil.

5.11.10 Air head replacement

The attaching screws for all airheads are to be tightened evenly and in rotation to the torque value given in

the torque values table. To avoid faulty valve operation, the 2

and 3rd stage air head attaching screws must

be tightened as closely as possible to the torque values given , and a feeler gauge is to be used between the air

head and cylinder to make certain the air head is drawn down evenly.

5.11.11 Radiator, Intercoolers and aftercooler

A set of tubes and radiator acting as heat exchangers are installed between each stage (intercoolers) and after
the last stage (aftercooler ). A moisture trap is installed after the 1

, 2nd and 3rd stage intercoolers and

downstream the aftercooler. As the compressed air is cooled in these tubes, the water vapors condensate; the
moisture traps cause the water in liquid state to collect in the bottom section of the trap, from where it is

preiodically removed through externally mounted automatic drain valves.
Servicing the Cooler Tubes:

Clean the surface of the tubes periodically; see “Maintenance Table” for recommended cleaning intervals.

5.11.14 Automatic drain valves

The automatic drain valves are simple, yet reliable draining devices, controlled with low-pressure air taken from
the second stage moisture trap. A Normally Closed 3 way low pressure solenoid valve sends the control air to

close the drain valves, and removes the control air to open them. A sequential timer in the control cabinet
controls the opening intervals and the time opened. See also the section under “Drain Timer”.

5.11.15

Filtration equipment

Prefilter:

The prefilter housing is made of stainless steel and it contains a disposable filter cartridge. Replace this cartridge

every 300 hours. At the first replacement, inspect its condition and if excessive dirt is observed, reduce the
replacement interval to 200 hours. If necessary, clean the housing as well. Use a clean lint free cloth to clean.

Make sure not to leave any parts or rugs inside the housing, which may block the air passages in the caps.

Purifier: