Rear Axle - Semi/Full Float Designs
Article No. 85-6-18AXLE - FORD 10.25" - FULLFLOAT DESIGN - 1985 RUNNING CHANGE
LIGHT TRUCK 1985 F-250 HD/F-350
A new 10.25" Ford axle will replace the HD Dana rear axles as a 1985 running change. The semi-float axle service procedure is included in the Light Truck Shop Manual - Section 15-09, the full-float information is contained in the TSB.
Description
The Ford design full-floating rear axle features brake drums that are mounted outboard of the hub. Therefore, when brake inspection or replacement is required the hub assembly need not be removed.
The hub is supported or "floats" on the axle spindle on two opposed tapered roller bearings.
The hub is retained on the spindle by a ratcheting nut that is tabbed to a slot on the spindle. The hub bearings are packed with a lithium base Multi-Purpose Lubricant Ford Service Part Number C1AZ-19590-B (ESA-M1C75-B) or equivalent. The grease provides initial lubrication
until axle lubricant flows into the wheel hubs and bearings during vehicle operation. If, for any reason, the hub is removed from the spindle, the old hub seal must be removed and a new hub seal installed.
The only functional differences between the Ford design semi-float integral rear axle assembly and the Ford design full-float integral rear axle assembly are as follows:
1. The semi-float axle shafts are retained in the axle by "C" washers.
2. The full-float shafts are retained by bolts attached to the hub.
3. A semi-float axle shaft rides on one (1) bearing at the outboard end.
4. The axle shaft on a full-float axle is attached to the hub, which rides on two bearings at the outboard end of the axle tube.
Figure 21 - Axle Shaft:
Hub Removal
1. Set the parking brake and loosen the 8 axle shaft attaching bolts.
2. Raise the vehicle to the desired working height, keeping the axle parallel with the floor.
3. Release parking brake and back off the rear brake adjustment, if necessary.
Figure 22 - Brake Drum:
Figure 23 - Brake Drum:
4. Remove the wheel and tire assembly.
5. Remove brake drum. Push-on (sheet metal) drum retainer nuts may be discarded.
Figure 24 - Axle Shaft Removal:
Figure 25 - Hub Wrench Installation:
6. Remove the 7/16-inch axle shaft bolts and remove the axle shaft.
CAUTION: The hub nuts are right hand-RH and left hand-LH thread.
7. Install Hub Wrench T85T-4252-AH so that the drive tangs on the tool engage the four slots in the hub nut.
Figure 26 - Hub Nut Removal:
8. Remove hub nut (counterclockwise for right hand thread; clockwise for left hand thread).
NOTE: The hub nut will ratchet during this operation.
Figure 27 - Plate Adapter Tool D80L-630-7:
Figure 28 - Puller Tool D80L-1002-L:
Figure 29 - Hub Bearing Removal:
9. Install Step Plate Adapter Tool D80L-630-7.
10. Install Puller Tool D80L-1002-L and loosen hub to the point of removal. Remove puller tool and step plate.
CAUTION: Do not drop outer hub bearing.
11. Remove hub assembly.
Figure 30 - Hub Installation:
Hub Installation
1. Clean spindle thoroughly after hub removal, then coat the spindle with axle lubricant.
NOTE: Hub bearings must be prelubed with grease prior to installation, Ford Part Number C1AZ-19590-B (ESA-M1C75-B) or equivalent.
Figure 31 - Hub Installation:
2. Pack bearing cone and roller assembly with a bearing packing tool, using lithium base multipurpose lubricant, Ford Specification ESA-M1C75-B Service Part Number C1AZ-19590-B or equivalent.
Figure 32 - Hub Outer Bearing:
Figure 33 - Hub Assembly:
3. Push hub and hub outer bearing onto spindle.
NOTE: Installing the hub in this manner causes the hub outer bearing to act as a pilot making the installation easier.
Figure 34 - Hub Nut Installation:
Figure 39 - Full Float Axle Hub Nuts:
4. Install the hub nut on the spindle. Turn hub nut clockwise for right hand-RH thread, counterclockwise for left hand-LH thread.
CAUTION: Make sure the hub nut tab is located in the keyway prior to thread engagement. See Figure 34.
Figure 35 - Hub Wrench Tool T85T-4252-AH:
5. Install Hub Wrench Tool T85T-4252-AH on spindle.
6. Install torque wrench and tighten hub nut 55-65 ft. lb. Rotate hub occasionally while tightening.
NOTE: The hub nut will ratchet as torque is applied.
7. After torquing to specification (55-65 ft.lb.), ratchet back five (5) teeth or notches on the hub nut. Five
(5) "clicks" must be heard during this operation in order to have it performed correctly.
Figure 36 - Axle Shaft Installation:
8. Inspect axle shaft O-ring seal for cracks, nicks or wear and replace if required.
9. Install the axle shaft.
10. Coat the threads of all eight (8) axle shaft retaining bolts with Loctite or equivalent.
11. Install and tighten axle shaft retaining bolts until they seat.
CAUTION: Remember, the last step of this procedure is to torque the axle shaft bolts.
Figure 38 - Wheel and Tire Assembly:
12. Install brake drum.
13. Install wheel and tire assembly.
Figure 37 - Filler Plug:
14. Loosen filler plug. If axle lube begins to seep out, retighten the plug. If there is no lubricant seepage, remove filler plug and fill to bottom of filler plug hole with specified lubricant.
15. Install filler plug and torque 15-30 ft.lb.
16. Lower the vehicle.
17. Make brake adjustments if necessary.
18. Torque wheel lug nuts, Single Rear Wheel (SRW) and/or Dual Rear Wheels (DRW) 125-155 ft.lbs.
19. Torque (8) axle shaft retaining bolts 60-80 ft.lbs.
Figure 40 - Hub Disassembly:
Figure 41 - Hub Inner Bearing:
Hub Disassembly
1. Install hub in soft jawed vise.
2. Remove hub seal.
3. Remove hub inner bearing.
Figure 42 - Inner Bearing Cup Removal:
Figure 43 - Outer Bearing Cup Removal:
4. Re-position the hub in the vise and remove the hub inner bearing cup with a brass drift.
CAUTION: Make sure hub is secure in vise.
5. Re-position the hub in the vise and remove the hub outer bearing cup with a brass drift.
Figure 44 - Bearing Cup Replacer T75T-1225-A:
Hub Reassembly
1. Place the outer bearing cup in the hub.
2. Insert tool squarely into hub and strike handle until outer bearing cup is seated.
Figure 45 - Hub Reassembly:
CAUTION: Bearing cup replacer must be held straight during installation to assure proper seating of bearing cup.
Figure 46 - HUB INNER BEARING CUP INSTALLATION:
3. Place the inner bearing cup in the hub.
4. Insert tool squarely into hub and strike handle until inner bearing cup is seated.
Figure 47 - HUB INNER BEARING CUP INSTALLATION:
CAUTION: Bearing cup replacer must be held straight during installation to assure proper seating of bearing cup.
Figure 48 - Inner Bearing Installation:
5. Place hub inner bearing in the cup.
Figure 49 - Hub Seal Installer T85T-1175-AH:
Figure 50 - Hub Seal Installation:
Figure 51 - Hub Seal Installation:
6. Install hub oil seal on hub seal installer tool as shown in drawing.
CAUTION: It is mandatory that the words "OIL SIDE" appear as shown when hub oil seal is installed
on hub seal installer tool T85T-1175-AH. "OIL SIDE" must face toward hub inner bearing.
7. Insert tool with seal squarely into hub.
Figure 52 - Hub Seal Installation:
8. Hold tool straight. Strike handle until hub seal is fully seated (until tool strikes hub).
CAUTION: Install new seal if seal is misaligned during or after installation.
Figure 53 - Hub Seal:
Figure 54 - Hub Seal:
Unitized wheel seals are available as standard items on full-floating rear axles. The unitized wheel seal combines the function of a wear sleeve and the seal in one self- contained unit with the seal and sleeve surface inside. The unitized design provides maximum protection for the sealing surface during installation and operation.
Figure 55 - Special Service Tools:
SPECIAL SERVICE TOOLS
SPECIFICATIONS: 10.25 INCH RING GEAR
The following applications are equipped with full-floating rear axles:
Limited Slip Differential Applications
F-350 Regular Cab F-350 Chassis Cab F-250/350 Heavy Duty
7400 Lb. GAWR 8200 Lb. GAWR 6250 Lb. GAWR
Dual Rear Wheels Dual Rear Wheels Single Rear Wheels
4.10:1 Ratio 3.55:1/4.10:1 Ratio 3.55:1/4.10:1 Ratio
Conventional Differential Applications
F-350 Regular Cab F-350 Chassis Cab F-250/350 Heavy Duty
7400 Lb. GAWR 8200 Lb. GAWR 6250 Lb. GAWR
Dual Rear Wheels Dual Rear Wheels Single Rear Wheels
3.55:1/4.10:1 Ratio 3.55:1/4.10:1 Ratio 3.08:1/3.55:1/3.73:1/4.10:1 Ratio
SPECIFICATIONS: 10.25 INCH RING GEAR APPLICATIONS
1985-1/2 "F" Series Truck - Full-Float
IDENTIFICATION CONVENTIONAL LIMITED-SLIP SINGLE DUAL
TAG RATIO DIFFERENTIAL DIFFERENTIAL REAR WHEEL REAR WHEEL
124A 3.08:1 x x
126A 3.55:1 x x
127A 3L55:1 x x
130A 4.10:1 x x
131A 4L10:1 x x
166A 3.55:1 x x
170A 4.10:1 x x
171A 4L10:1 x x
1985-1/2 "F" Series Truck - Chassis Cab - Full-Float
IDENTIFICATION CONVENTIONAL LIMITED-SLIP SINGLE DUAL
TAG RATIO DIFFERENTIAL DIFFERENTIAL REARWHEEL REARWHEEL
146A 3.55:1 x x
150A 4.10:1 x x
151A 4L10:1 x x
186A 3.55 x x
187A 3L55:1 x x
190A 4.10:1 x x
191A 4L10:1 x x
Figure 53 - Hub Seal:
SPECIAL SERVICE TOOLS
TOOL NUMBER DESCRIPTION
T85T-4252-AH Hub Wrench
D80L-630-7 Step Plate Adaptor
D80L-1002-L Puller (Hub)
T80T-4000-W Driver Handle
T75T-1225-A Bearing Cup Replacer - Outer
T85T-1225-BH Bearing Cup Replacer - Inner
T85T-1175-AH Hub Seal Installer
LUBRICANT CAPACITIES AND CHECKING PROCEDURES (INTEGRAL CARRIER) - CONVENTIONAL AND LIMITED SLIP
APPROXIMATE LUBRICANT CAPACITY (1)(4)
VEHICLE ENGINE AXLE U.S. PINTS IMPERIAL PINTS LITERS
F-350 Regular & Chassis Cab All 10-1/4 Inch 6.0 (2)(3) 5.0 2.8
F-250/350 H.D. All Ring Gear 6.0 (2)(3) 5.0 2.8
(1) All conventional axles use Hypoid Gear Lubricant E0AZ-19580-A (ESP-M2C154-A) or equivalent.
(2) Below bottom of filler plug hole with vehicle in running position.
(3) For out of vehicle repair, add 7.5 U.S. pints of lubricant.
(4) Plus 4 oz. (U.S. measure) additive friction modifier, C8AZ-19B546-A (EST-M2C118-A) or equivalent for limited slip applications.
TORQUE SPECIFICATIONS - FULL-FLOAT
Torque
DESCRIPTION N-m Ft. Lbs.
Hub Nut 75-88 55-65*
Filler Plug 21-40 15-30
Wheel Lug Nut (both
Single & Dual Rear 170-210 125-155
Wheel)
Axle Shaft Bolts 82-108 60-80
* Before ratcheting back 5 notches.
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: "INFORMATION ONLY"