Install the cover (3) in position; move back and forth until the cartridge pins (11) drop into the cover holes. Oil
and install the cover-to-body bolts (2). Torque to 70 inch pounds. Turn the pump shaft by hand to verify
freedom of the cartridge.
Install the pump on the power take-off flange and fasten it with its two mounting bolts. Torque the bolts to 75
inch pounds. Connect and tighten the hydraulic hoses.
4-20 MAINTENANCE OF FRAME COMPONENTS
4-20.1 Drill Platform Assembly (Figure 4-48).
Unhook the double end snap (5). Remove the center platform (6); then remove nuts (1, 2), lockwashers (3), and
bolts (4) to remove drillers platform (7) and helpers platform (8).
Clean the platforms frequently to prevent excessive build-up of mud. Use a wire brush to remove corrosion or
rust; repaint as necessary. Repair minor damage by welding; replace platforms if major damage has occurred.
Hold the platforms (7, 8) in place and fasten to the rig with bolts (4), lockwashers (3), and nuts (1, 2). Finally,
place the center platform (6) between the other two. Hook up the double end snap.
4-20.2 Mud Flap Assembly.
If mud flaps are worn, damaged, partially gone, remove their fasteners (bolts, washers, and nuts) and replace
with new flaps. No other maintenance is required.
4-20.3 Frame Assembly.
Keep the rig as clean as time will permit. Examine the frame components periodically for evidence of corrosion,
rusting, broken welds, dents, or other damage. Hammer out any minor dents or bends. Repair minor damage by
welding; remove rust and corrosion with a wire brush. Keep the rig well-painted at all times.