Dodge HYDROIL TORQUE-ARM HXT325C, Parts Replacement Manual

5

REMOVING TAPER BUSHED REDUCER FROM 

SHAFT

WARNING: External loads may cause machine movement. 

Block machine before removing any drive train 

components. Failure to observe these precautions could 

result in bodily injury.

1.  Remove bushing screws.
2.  Place the screws in the threaded holes provided in the 

bushing flanges. Tighten the screws alternately and 
evenly until the bushings are free on the shaft. For ease of 
tightening screws make sure screw threads and threaded 
holes in bushing flanges are clean.

3.  Remove the outside bushing, the reducer and then the 

inboard bushing.

DISASSEMBLY

1.  Remove all bolts from housing. Drive back hollow dowel 

pins on either side of housing. Remove backup plates and 
snap rings on the output hub on taper bushed reducers. 
Open housing evenly to prevent damage to parts inside.

2.  Lift shaft, gear and bearing assemblies from housing.
3.  Remove seals, seal carriers and bearing cups from 

housing.

REASSEMBLY

1.  Output Hub Assembly: Heat gear to 325º to 350ºF for 

shrinking onto output hub. Heat bearing cones to 270º to 
290ºF for shrinking onto output hub.

2.  Countershaft Assembly: Heat gear to 325º to 350ºF and 

bearing cones to 270º to 290ºF for shrinking onto shaft.

3.  Input Shaft Assembly: Shaft and pinion are integral. Heat 

bearing cones to 270º to 290ºF for shrinking onto shaft.

4.  Drive the dowel pins back into position in the right hand 

housing half.

5.  Install countershaft cover in right-hand housing half. Place 

housing half on blocks to allow for protruding End of output 
hub. Install bearing cups in right-hand housing half making 
sure they are properly seated.

6.  Mesh output hub gear and small countershaft gear together 

and set in place in housing. Set input shaft assembly in 
place in the housing. Make sure bearing rollers (cones) are 
properly seated in their cups. Set bearing cups for left-
hand housing half in place on their rollers.

7.  Clean housing flange surfaces on both halves, making 

sure not to nick or scratch flange face. Place a new bead 
of gasket eliminator on flange face and spread evenly over 
entire flange leaving no bare spots. Place other housing half 
into position and tap with a soft hammer (rawhide not lead 
hammer) until housing bolts can be used or draw housing 
halves together. Torque housing bolts per torque values 
listed below

8.  Place output hub seal carrier in position without slims and 

install two carrier screws diametrically opposed. Torque 
each screw to 25 lb.-ins. Rotate the output hub to roll in 
the bearings and then torque each screw once to 50 lb.-
ins. Do not retorque screws. Again turn output hub to roll 
in the bearings. With a feeler or taper gage, measure the 
gap between the housing and the carrier, clockwise from 
and next to each screw. To determine the required shim 
thickness, take the average of the two feeler gage readings. 
Remove carrier and install the required shims. Note: Total 
shim thickness per carrier should not include more than 
.009” plastic shims and each plastic shim should be 
inserted between two metal shims. Place a 1/8” diameter 
bead of Dow Corning RTV732 sealant on the face around 
the I.D. of the end shim (sealant is to be between reducer 
housing and shim) and install carrier on reducer housing. 
Torque carrier bolts to value shown in Table 5. Output hub 
should have an axial end play of .001” to .003”.

9.  Adjust the countershaft bearings using the same method 

as in step 8 above. The axial end play should be .001” to 
.003”.

10.  Again using the same procedure as in step 8, adjust the 

input shaft bearings, except the axial end play should be 
.002” to .004”.

11.  Apply sealant to the input shaft cover gasket and install 

input shaft cover in right-hand housing half. Install input 
and output seals. Extreme care should be used when 
installing seals to avoid damage due to contact with sharp 
edges on the input shaft or output hub. This danger of 
damage and consequent oil leakage can be decreased by 
covering all sharp edges with tape or paper prior to seal 
installation. Fill cavity between seal lips with grease. Seals 
should be pressed or tapped with a soft hammer evenly 
into place in the carrier applying pressure only on the outer 
edge of the seals. A slight oil leakage at the seals may be 
evident during initial running in but should disappear unless 
seals have been damaged.

12.  Install bushing back-up plate and snap rings.