Main Disassembly
Grip handle body (24) firmly in a vice (use leather or copper covered vice jaws).
Remove muffler retaining clip (10) from its groove in the cylinder (SK9 models only).
Insert three or four pieces of thin sheet steel approximately 8 mm wide, beneath the retaining lip of the
muffler moulding (9) (small diameter end). These will allow the rubber retaining lip of the muffler to slide
along over the groove in the cylinder and ease removal of the muffler.
Slide off muffler (9) over the cylinder exposing the cylinder flats.
Remove locking pin (7) from its hole in cylinder, the pin is provided with an M4 internal thread to assist
removal.
Remove the handle from the vice, invert the pickhammer and grip the flats of the cylinder in the
vice. Use a pipe about 1.5 Meters long positioned through the loop of the handle to first loosen
and then completely unscrew the handle assembly from the cylinder and remove. –
Warning –
once the handle is unscrewed from the cylinder the piston and valve parts will be free to fall and
could cause injury.
Handle Disassembly
Grip handle body (24) in leather or copper covered vice jaws and unscrew throttle valve plug (29) using a
13 mm spanner.
Withdraw throttle spring (28), throttle ball (27) and throttle pin (32).
Remove the trigger (25) by pressing or drifting out trigger pin (26).
Unscrew quick release coupling (31) from inlet bushing (30).
The inlet bushing (30) can be removed if required though it is assembled into the handle using a high
strength retainer and disassembly is not normally necessary.
Cylinder Disassembly
Remove the spacing washer (6) and valve plate (5).
Slide off valve ring (4) from cylinder (1).
Allow piston (3) to slide out of the cylinder bore and be caught.
The nozzle (2) is pressed into the cylinder and retained with Loctite 601 – do not disassemble unless
replacement is necessary.
ASSEMBLY OF THE SK9 AND SK13 PICKHAMMERS
General Instructions
•
Before assembly of the pickhammer, clean all parts thoroughly and lubricate surfaces with a thin film
of recommended oil – (see lubrication).
•
Apply a thin film of O-ring lubricant to all O-rings before final assembly.
•
It is recommended that the assembly of the nozzle (2) be carried out by the manufacturer or
authorised distributor.
•
The existence of a piston air cushion should be determined. Hold the cylinder vertically and allow the
piston to drop down the bore small diameter first. An air cushion is present if the piston “bounces”, at
the bottom of the cylinder and no metal to metal contact noise can be heard. If a cushion is not
present contact your authorised Permon repair centre for advise.
Cylinder assembly
Grip the cylinder (1) vertically in a vice protected with leather or copper covered vice jaws.
Lubricate and insert the piston (3) small end first into the bore. Check for air cushion.
Lubricate and slide the valve ring (4) onto the cylinder and replace the valve plate (5).
Replace the spacing washer (6) on top of the valve plate.
Summary of Contents for SK 9-5
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