BRAKE WEAR LIMITS CHART

If linings are worn to within 1/16" of retaining bolts or

Oil Seals, Gaskets and Retaining Rings

otherwise damaged, replace brake linings.

Replacement of spring loaded oil seals, gaskets

Check cam shaft brake spider bushings and brake

and snap rings is more economical when unit is

chamber bracket bushings for wear, cracks, distortion,

disassembled han to risk premature overhaul to replace

or other damage. If inside diameter is worn beyond

these parts at a future time. Loss of lubricant through a

dimensions indicated in Brake Wear Limits Chart,

worn seal may result in failure of other more expensive

replace bushings.

parts of the assembly. Sealing members should be

Inspect brake drums for cracks, heat checks,

handled carefully, particularly when being installed.

scoring, or other damage. Turn down on lathe if

Cutting, scratching, or curling under of lip of seal

necessary.

If drum diameter exceeds dimensions

seriously impairs its efficiency. At reassembly, lubricate

indicated in Brake Wear Limits Chart, replace drum.

lips of oil seals with Lubriplate.

Replace brake shoe return springs each time axle

is overhauled.

Gears and Shafts

If magna-flux process is available, use process to

BRAKE WEAR LIMITS CHART

check parts. Examine teeth and ground and polished

surfaces on all gears and shafts carefully for wear,

pitting, chipping, nicks, cracks or scores. If gear teeth

ITEM

20x5

16 x 6

are cracked or show spots where case hardening is worn

20x7

through, replace with new gear. Small nicks may be

removed with suitable hone. Inspect shafts to make

Anchor Pins-O. D

1.478"

1.228"

certain they are not sprung, bent, or splines twisted, and

Broke Drum-Max. Rebore

20.250"

16.750"

that shafts are true. Differential pinions and side gears

Broke Shoe Bushings-I. D

1.51"

1.263"

must be replaced as sets. Differential ring gear and

Camshaft Bushings-I. D

1.526"

bevel pinion must also be replaced as a set if either is

Camshaft-O. D

1.469"

damaged.

Cam Roller-I. D

.895"

.770"

Cam Roller Pin-O. D

.859"

.735"

Housing and Covers

Inspect housing, covers and planet spider, and

Parking Brake

differential case to be certain they are thoroughly

Inspect brake backing plate for distortion. Check

cleaned and that mating surfaces, bearing bores, etc.,

that cam levers on backing plate swivel freely, but that

are free from nicks or burrs. Check all parts carefully for

mounting rivets are firmly seated in plate. Replace

evidence of cracks or conditions which would cause

backing plate if damaged or if cam levers are loosely

subsequent oil leaks or failures.

mounted.

Inspect brake linings for grease saturation, wear,

Service Brakes

or looseness. Replace if worn to less than 5/32 inch.

Inspect anchor pins for wear or damage. If they

Rivet new brake linings to shoes following sequences

are worn beyond dimensions indicated in Brake Wear

indicated in Fig. 87.

Limits Chart, or if they are pitted, scored or deeply

nicked, replace anchor pins.

Check brake shoe bushings for wear. If inside diameter

exceeds dimensions indicated in Brake Wear Limits

Chart, replace bushings.

Check cam roller for wear and distortion. If inner

diameter is worn beyond dimensions indicated in Brake

Wear Limits Chart, or if outer diameter has flat spot

more than 1/4 inch wide extending across roller, replace

rollers. Check cam roller pins for wear and corrosion. If

worn beyond dimensions indicated in Brake Wear Limits

Chart, or if pitted, scored, or deeply nicked, replace cam

roller pins.

Inspect brake drums for cracks, heat checks,

Inspect cam shafts for wear or corrosion of

scoring, or other damage. Turn down on lathe if

bearing surfaces. If worn beyond dimensions indicated

necessary. If drum diameter exceeds 13.340 inches,

in Brake Wear Limits Chart, or if bearing surfaces are

replace drum.

pitted, scored, or deeply nicked, replace cam shafts.

Check brake linings for wear, cracks, and oil saturation.