Spicer Tandem Drive Axles Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 - Manual (Page 24)

20
Differential Lockout
Differential Lockout Overhaul
Instructions for the three different designs are on the following
pages:
Cast Iron Cover Lockout - Overhaul on page 20
Original Design Lockout - Overhaul on page 21
Cylindrical Design Lockout - Overhaul on page 22
Cast Iron Cover Lockout - Overhaul
Disassemble and Remove Lockout
Note: With axle installed in vehicle, place differential lock se-
lector valve in the disengaged (or unlocked) position.
Disconnect the air line at the lockout piston cover.
1. Remove capscrews and lock washers fastening pis-
ton housing to power divider cover. Remove the cast
iron piston housing.
2. Remove lock nut, piston with o-ring, piston driver
and compression spring from push rod.
Note: The shift fork and push rod cannot be removed with
power divider cover installed (see Remove Power Divider on
page 24).
Lockout Interchangeability
The cast iron design lockout assembly is interchangeable with
previously designed lockouts, only as a complete assembly.
The original shift fork and push rod can be used for all three
design type lockouts and need not be replaced.
Retrofit kits are available to convert the non-current design
lockouts to the current cast iron cover design lockout. For ad-
ditional information, refer to Dana Parts Books AXIP-0085.
Retrofit as follows:
1. Disassemble and remove the old design lockout.
2. Assemble and install the cast iron cover lock-out.
Mounting screws are not interchangeable between the vari-
ous design style lockouts. They are a different length and
size.
Assemble and Install Lockout - Cast Iron
Cover Design
1. With shift fork and sliding clutch installed, install
compression spring on push rod.
2. Place piston driver on push rod against compression
spring. The large diameter end of piston driver must
face power divider cover.
3. Lubricate o-ring with silicone-based lubricant and in-
stall o-ring on piston.
4. Place piston assembly on push rod against piston
driver.
5. Install lock nut on push rod and tighten to 13-17 lbs.
ft. (18-23 N•m).
6. Apply silicone gasket compound to mounting surface
on power divider cover.
7. Install piston housing cover.
8. Install capscrews and tighten to 48-56 lbs. ft.
(65-76 N•m).
9. If axle is installed in vehicle, apply sealant to air line
fitting and connect air line.
CAUTION
1 - Lockout silicone gasket pattern
1