Viking Pump TSM280: Duralobe (Discontinued) - Manual (Page 39)

Page : 37
Fig 21
- Heat cones to 250°F and install rear bearing cones (19) to shafts
(items 9 and 10 see fig 5.6 on page 60). Do not use excessive
pressure as rolling torque is achieved by adjusting rear lock nuts (12).
- Install gear keys (57) and gears (14) into position insuring that the gear
boss contacts with the rear bearing cone (19).
Note: Right hand helix for drive shaft gear (stamped D), left hand helix
for driven shaft gear (stamped L).
Note: When ordering spare timing gears it is essential to purchase and
install these as a pair.