Product Manual

13
Top Driver Body
• Wear eye protection.
• To remove the hammer, gently tap the main cast housing vertically down on a soft bench top, and it
should slide out of the barrel. Locate the Viton O-ring and replace it at this time. The hammer is made
of high-quality, hardened-tool steel and should not show any signs of wear. Thoroughly clean the
hammer.
• To remove the piston and connecting rod, you will need to remove the LEFT-HAND THREAD crank
pin from the crank, and gently push the piston through the bottom of the housing. To access the
crank pin, see the guidelines listed above in the section of this manual titled Service & Maintenance
on page 9. Use caution when holding the connecting rod and crankshaft as to not damage these
components.
• Clean and inspect the piston and connecting rod. Insert the crank pin into the bearing on the
connecting rod to check for fit. If there is excessive play or side-to-side movement, it is possible you
may need to replace the crank pin. Check the movement in the bearing in the piston side. If there is
excessive play, the connecting rod should be replaced. Locate the Viton O-ring on the piston and
replace it at this time. See Figures 7 and 8.
Figure 7: Location of left-hand thread crank pin
Figure 8: Piston with connecting rod in place
• Cl
ean and inspect the cylinder and crank case for any damage or excessive wear. Replace any
damaged parts you may identify.
• Remove the inner springs of the handle to clean and lubricate each one. Check all handle cups for
any excessive wear. Clean and lubricate the upper and lower cups.