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REPLACEMENT OF PARTS

Dodge is prepared to repair Screw Conveyor Drive speed

reducers for customers who do not have the proper facilities or

for those who desire factory service. However, if the customer

has access to an arbor press, equipment for heating and

shrinking bearings and gears on shafts, and the tools normally

found in a maintenance department, the Screw Conveyor Drive

speed reducer can easily be disassembled and reassembled by

careful attention to the following instructions.

Cleanliness is very important to prevent the introduction of

dirt into the bearings and other parts of the reducer. The oil

seals are of the rubbing type and considerable care should be

exercised during disassembly or reassembly to avoid damage to

the surfaces on which these seals rub. Any sharp edges on the

input shaft or output hub should be covered with adhesive tape

or paper before performing any work on the unit. Nicks and burrs

on surfaces of the input shaft or output hub should be removed.

ORDERING PARTS

When ordering parts for reducer, specify Screw Conveyor Drive

size and serial number, part name, part number, and quantity.

Parts that must be pressed from shafts or output hub should be

removed before ordering parts. This assures that those parts, if

damaged during pressing operation, will be replaced.

It is recommended that when a pinion or gear is replaced, the

mating gear or pinion be replaced also. This insures that the

gear teeth will mesh properly. If the large gear on the output hub

must be replaced, it is suggested that an output hub assembly,

consisting of a gear assembled on an output hub, be ordered to

secure an output hub with undamaged surfaces on which the oil

seals rub. However, if the old output hub is to be used, carefully

press the gear and bearing cones off. Thoroughly examine the

area under the oil seals for scratches or any other damage

resulting from the pressing operation. To prevent leakage at the

oil seals, the rubbing area must be smooth.

Replacements for the old oil seals should be ordered, due to the

probability of these parts being damaged during disassembly.

If replacing a bearing, output hub, or a shaft, it is advisable to

order a set of shims for adjustment of bearings on the shaft

assembly.

If replacing a housing, a set of shims should be ordered for each

shaft assembly because the adjustment of the bearings on each

shaft assembly is affected.

REMOVING SCREW CONVEYOR DRIVE FROM THE

TROUGH END

Disconnect any electrical power to the drive. Drain lubricant from

reducer. Uncouple drive shaft and screw. Remove nuts from

trough end studs. Support drive by means of hoist and carefully

pull unit away from trough end to slide drive shaft out of screw.

DISASSEMBLY

Remove retainer bolt, lockwasher, and shaft retainer from

drive shaft. Pull drive shaft out of reducer from adapter side.

Remove adapter.

Position reducer on its side and remove all bolts. Gently tap

the output hub and input shaft with a soft hammer (rawhide,

not lead hammer) to separate the housing halves. Open

housing evenly to prevent damage to the parts inside.

Lift shaft, gear, and bearing assemblies from housing.

Remove seals, seal carriers, and bearing cups from housing.

Clean all parts in solvent, inspect for damage, and coat with

oil.

REASSEMBLY

Output Hub Assembly: Heat gear to 325ºF to 350ºF to

shrink onto hub. Heat bearings to 270ºF to 290ºF to shrink

onto hub. Any injury to the hub surfaces where the oil seals

rub will cause leakage, making it necessary to use a new

hub.

Countershaft Assembly: Shaft and pinion are integral.

Press gear and bearings on shaft. Press against inner (not

outer) race of bearings.

Input Shaft Assembly: Shaft and pinion are integral. Press

bearings on shaft. Press against inner (not outer) race of

bearings.

Drive the two dowel pins into place in the right-hand housing

half. Apply RTV732 sealant to carriers for R.H. side (backstop

side) of reducer. Install carriers and torque bolts per Table 5.

Place R.H. 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.

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.

Clean housing flange surfaces on both halves, making sure

not to nick or scratch flange face. Place a 1/8" bead of

RTV732 sealant on flange face (make sure RTV is placed

between bolt holes and inside of flange face). Place other

housing half into position and tap with a soft hammer

(rawhide, not lead hammer) until housing bolts can be used

to draw housing halves together. Torque housing bolts per

torque values listed in Table 5.

Place output hub seal carrier in position without shims and

install two carrier screws diametrically opposed. Torque

each screw to 25 in.-lbs. Rotate the output hub to roll in the

bearings and then torque each screw to 50 in.-lbs. Again

turn output hub to roll in the bearings. With a feeler or taper

gage, measure the gap between the housing and the carrier

flange. To determine the required shim thickness, take the

average of the two feeler gage readings. Remove carrier and

install the required shims plus .002. Install carrier with shims

and torque bolts per Table 5. Rotate hub assembly, tap

lightly with rawhide mallet on end of hub, while rotating, to

ensure bearings are seated. Using a dial indicator check end

play of hub bearings, endplay should be 001–.003. Repeat

this process as necessary to obtain proper end play. Place

a 1/8" diameter bead of RTV732 sealant inside the carrier at

the shim I.D. and install carrier on reducer housing. Torque

carrier bolts to value shown in Table 5.

10. Adjust the countershaft bearings using the same method as

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

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

input shaft bearings, except the axial end play should be

.002" to .004".

12. Using gaskets or RTV732 install input shaft cover and

counter shaft cover to 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. The possibility of

damage and consequent oil leakage can be decreased by

covering all sharp edges with tape 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, but should disappear unless seals

have been damaged.

13. Install bushing backup plates and snap rings on Taper

Bushed reducers or hub collars on straight bore reducers.