8" Protector Tube Assy: Steps 1-6
8" Expansion Ring Assy: Steps 7-12

Protector Tube reference part list:
Back Reamer Core (D168 or D222)
Protector Tube (D185)
Pulling Eye
Bolts, 5/8-11 UNC (4 required)
O-Rings, 2-210 (4 required)
Water Jet Nozzles (varies)




Protector Tube

Set screws             O-rings              O-rings

STEP 7: Clean all parts before proceeding with assembly.

STEP 8: Place O-rings (4 places) into counterbores on Expansion Ring [Fig 6]. O-rings will seal water passage between Expansion Ring and Reamer Core.

STEP 9: Align Expansion Ring dowel holes with fixed dowels on Reamer Core and install [Fig 7].

STEP 10: Insert 5/8” Bolts (4 places) through the back of the Expansion Ring and thread into Reamer Core [Fig 8]. Torque Bolts to 210 ft-lb.

STEP 11: Install Water Jet Nozzles into Reamer Core [Fig 9] and Expansion Ring [Fig 10]. Nozzles may be installed at any time during assembly.

STEP 12: Attach Pulling Eye [Fig 10] using the nut and bolt supplied.

Fig. 10

Backreamer and Expansion Ring are now assembled.

Fig. 6 (O-ring in counterbore)


Fig. 7 (Fixed dowels)