Alamo GR60, GR72 Input Shaft Installation

MAINTENANCE

GR60/72 02/07 Maintenance Section 5-11

MAINTENANCE

1. Install Upper Output Shaft Bearing Cup (item # 12) into Main Housing from the top, Install Output Shaf t

Lower Bearing Cup (item # 2) into Main Housing (item # 1) from the bottom, Make sure both Bearing

Cup are seated firml y agai n st ho us ing .

2. Install Lower Bearing Cone (item #2) down over Output Shaft from top making sure it is completely

seated against shoulder on lower part of Output Shaft.

3. Insert Output Shaft (item # 8) into Main Housing from the bottom till Lower Bearing Cone is seated into

Lower Bearing Cup, Slide Upper Bearing Cone down over Output Shaft from the till it seats down

against and into upper output Shaft Bearing Cup.

4. Slide Output Gear (item # 9) down over Output Shaft till it sits against upper Bearing Cone.

5. Install Output Shaft Bearing Adjusting nut (item # 10) Tighten Nut to set Pre-Load on Output Shaft

Bearings. Bearing Preload sh ould be from 12 to 14 inch pounds of Rolling Torque.

6. Using Soft Metal (Brass or Aluminum) Pin, Strike both ends of Shaft with a hammer and recheck the

Bearing Pre-Load, This is to ensure Bearings and components are centered and seated. If Bearing

Pre-Load is OK inse rt Cotter Pin (item # 11) and Bend ends.

7. To Install the Output Seal, Put a lig ht co at of Grease on ID o f Se al o r o n OD of shaft where Seal rides.

Install the Output Seal using a Seal Driver.

Input Shaft Installation

1. Install Inner Bearing Cup (item # 12) into back of main Housing (item # 1). Make sure Cup is seated

into Main Housing.

2. Install Outer Bearing Cup (item # 12) into back of Front Bearing Cover (item # 24). Make sure Cup is

Seated into front Cover.

3. Install Spacer (item # 13) onto Back side of Input Shaf t (item # 26), Inst all S p acer (item # 28) onto input

Shaft (item # 26) from the front. Install Shims (item # 29,30 & 31) onto input Shaft from the front. For

quantity of Shims refer to Step 7. on Input Shaft Removal.

4. Install Inpu t Gear (item #27) on to Input Shaf t from the fro nt, Inst all Oute r Bearing Co ne (ite m # 12) on

to input shaft and slide down till it seat s against Gear. Install Inner Bearing Cone (item # 12) onto input

shaft.

5. Slide Input Shaft with all components down into Main Housing till Inner Bearing Cone is seated into

Inner Bearing Cup. Look at Input Gear and Output at this time, Input Gear should not be held up by

Outer Gear, if it is it will be required to add Shims (item # 29,30 & 31). If Input Gear and Output Gear

seem to far away from each other remove some Shims (item # 29,30 & 31).

6. Input Seal (item # 25) can be installed now or wait till later. With Shims (item # 20,21 & 22) lower Input

Bearing Cap (item # 24) down over Input Shaft. Install Bolts (item # 23) into Bea ring Cap and tighten

them, Check Bearing Pre-Load and Gear Back La sh. Bearing Preloa d should be from 12 to 14 po unds

of Rolling Torque, Gear Back Lash should be from .016" to .021". If these are not, shims will have to be

removed or add ed to get these readings.

7. Install Top Cover (Item # 18) and Gasket (item # 19), Install Pressure Vent Plug (item # 16) with

Sealing Washer (item # 17), Vent Plug must be 5 pounds pressure relief type.

8. Fill Gearbox with Oil, remove Oil Level Plug (item # not shown) on side of Main Housing, Remove the

vent Plug (item # 16) and fill with oil till oil starts to seep out of Oil Level Plug, Stop and wait about 20

minutes so oil will have time to seep down around Output Shaft bearings then finish filling with oil, This

procedure may take longer on Cold days or Shorter on Hot days. Always recheck Oil Level after

gearbox has bee n ru n ap pr o x im at ely 1/ 2 ho ur.