Tri Tool 642SB Clamshell Air and Hydraulic - Manual (Page 13)

13
Model 642SB Low Profile Clamshell
92-0612 Rev. 131230
WARNING:
Too much torque may crack the Bearing, while too little torque may allow the
Bearing pre-load to relax.
INSPECTION OF THE MAIN GEAR
If the Headstock does not run smoothly, even after adjustment, inspect the Main
Gear to ensure that no chips, dirt or dust has damaged the gear.
Remove the front Thrust Plates by removing the (48) forty-eight Hold Down Screws.
Lift the Headstock from the Housing. Refer to the Clamshell nomenclature.
The Main Gear and the Main Bearings may now be inspected.
Check the Bearings, Housing, and the race on the Gear.
All surfaces should be smooth, without scratches, and they should feature even
wear patterns over the entire surface.
Relax the Bearing Adjustment Screws (1, 30, 15, 16, 7, 8, 22, and 23) and lightly turn them
in until they make contact with the Head Stock.
Connect the Power supply and apply power to the Clamshell so that the Clamshell is
running at full speed.
Lightly adjust the Bearing Adjustment Screws in the following sequence until the Clamshell
rotation slows slightly:
1, 30, 15, 16, 7, 8 22, 23, 2, 3, 17, 18, 9, 10, 24, 25, 4, 5, 19, 20, 11, 12, 26, 27, 6, 21, 13,
14, 28, and 29.
Listen for a change in the sound of the Drive Motors.
Adjust the Bearing Adjustment Screws in small increments to that the Bearings are loaded
evenly.
All of the Bearing Adjustment Screws should have a torque of at most 1 in-lb (0.1 N-m) to
insure that the bearings are uniformly loaded.
Over-tightening the Bearing Adjustment Screws will result in accelerated bearing wear,
lower available power, and excessive heat.
Lock the Bearing Pre-load by tightening the Bearing Adjustment Lock Screws (1 through
30)
Bearing Adjustment Lock Screw torque should be 5 to 10 ft-lbs (.6 to 1.1 N-m).