Christie Easy Petrol Post Driver CHPD78-1, Safety, Operation & Maintenance Instructions

Page: 19 / 32

13
Remove the bottom hammer assembly from the Cast Bottom Housing (CEPD 925).
Remove the 3
rd
Hammer (CEPD 937) using a 6mm punch to carefully push the two
retaining dowel Pins (CEPD PIN 8x36) from the Hammer Housing.
• A vice and some soft jaws may aid in holding the round hammer guide and
hammer in place.
Inspect the internal Viton O ring seal (BS220) inside the hammer guide for wear or
damage, replace if necessary.
Inspect the Damper Washer (CEPDDAMPER3MM) for wear. This sits on the Hammer
Housing between the Flange Adapter. Replace if required.
• The 3
rd
Hammer (CEPD 937) is made from high quality steel and should not be a
wearing component, but ensure a visual inspection is carried out after cleaning
for wear or damage and replace if necessary.
To remove the Top Hammer, gently tap the main Crank Housing (CEPD924) vertically
down on a soft bench top and it should slide out of the inner Steel Cylinder Liner
(CEPD 24-1).
• Take note of the orientation of the components as in the parts diagram.
If the Top Hammer O-ring (BS222) shows obvious signs of wear, the top piston
(CEPD30) can be removed from the crank by:
• Remove the Cover Plate (CEPD37) to gain access to the crank assembly.
•
Remove the Left Hand thread Crank Pin (CEPD 38 PIN) from the crank.
• Jam the Connecting Rod (CEPD31) with a round metal bar, and gently push the
Piston and Connecting Rod through the bottom of the housing using a soft metal
rod.
DO NOT USE A SQUARE OR SHARP OBJECT TO JAM THE CONNECING ROD .
• Orientation is not critical on the piston or connecting rod.
• Check the Piston (CEPD 30) and Viton O ring (BS222) for any signs of wear, and
replace along with top hammer O ring (BS222) if necessary.
• Wash all grease from the housing and components using a degreaser solvent and
inspect the inner barrels for wear and deep scores.
• If the Steel Cylinder Liner is scored or too badly worn the entire Post Driver should
be sent back to Easy Petrol Post Driver for repair or replacement of the inner liner.