Dodge MRC-TC06NC Manuel d'instruction - Page 2

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REPLACEMENT PARTS

With 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 MIMA SCXT325A 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 the 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, specify MIMA SCXT325A and part number,

part name, 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, its

mating gear or pinion be replaced also. This ensures 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 oil 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 bearings on each

shaft assembly is affected.

WARNING:

Equipment being removed may be too heavy to

control manually. Support it by external means. Failure to

observe these precautions could result in bodily injury.

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

Position reducer on its side and remove bolts. Gently

tap the output hub and input shaft with a soft hammer

(rawhide, not a 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.

WARNING: Solvents can be toxic and/or flammable. Follow

manufacturer's safety procedures and directions. Failure

to observe these precautions could result in bodily injury.

Reassembly:

Output Hub Assembly: Heat gear to 325° to 350°F for

shrinking onto output hub. Heat bearing cones to 250° to

270°F for shrinking onto output hub.

Countershaft Assembly: Heat gear to 325° to 350°F and

bearing cones to 250° to 270°F for shrinking onto shaft.

Input Shaft Assembly: Shaft and pinion are integral. Heat

bearing cones to 250° to 270°F for shrinking onto shaft.

Drive the dowel pins back into position in the right hand

housing half.

Install countershaft cover and input bearing 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.

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-

handed 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 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 to draw housing

halves together. Torque housing bolts to 720 lb-ins.

CAUTION: If too much sealant is used, it will run into

the bearing, and too little sealant will result in an

ineffective seal.

Apply RTV to all seal O.D.s. Extreme care should be used

in installing seals on input shaft and output hub to avoid

damage to seals due to contact with sharp edges of the

keyseat in the input shaft or the retaining ring groove in

the output hub. This danger of damage and consequent

oil leakage can be decreased by covering the keyseat

and groove with tape or paper which can be removed

subsequently. Chamfer or burr housing bore if end of

bore is sharp or rough. Fill cavity between lips of seal

with grease. Seats should be pressed or tapped with a

soft hammer evenly into place in the housing, applying

force only on outer corner of seals. A slight oil leakage at

the seals may be evident during initial running in, but will

disappear unless the seals have been damaged.

Place output hub seal carrier in position, shim and torque

bolts per special procedures.

Fill with approximately 3¼ quarts of Mobil SHC 634 oil, ISO

460 VG.