Specifications

Prepare Parts for Reassembly
36 MAINTENANCE MANUAL
NOTE:
Meritor drive pinions and ring gears are only
available as matched sets. Each gear in a set
has an alphanumeric match number.
NOTE:
Don’t use the pinion cone variation num-
ber when you check for a matched gear set.
Use this number when you adjust the pin-
ion depth of the differential assembly. See
Section 5.
Table C: Gear Set Match Number
Examples
Table A: Gear Set Part Numbers
Table D: Pinion assembly dimension Varia-
tion value
Table B: Gear Set Tooth Combination Num-
ber
Check for Mismatched Ratios on Tan-
dem Axles
For a tandem axle pair to function correctly,
the forward and rear axles must operate with
axle ratios within one percent. A mismatched
tandem axle pair can cause differential over-
heating, hypoid gear set wear, metal debris to
collect on the magnetic drain plug, differential
lubricant additive depletion, excessive inter-
axle wear and noise.
To determine if the tandem axle ratios oper-
ate within allowable limits, refer to one of the
following procedures, You perform the proce-
dure that will work best for the vehicle you are
servicing.
PART NUMBER
LOCATION
Conventional ring
gearl
36786
On the front face or
outer diameter
Conventional drive
pinion
36787
At the end at
threads
Generoid ring gear
36786K o
36786K2
On the front face or
outer diameter
Generoid drive
pinion
36787
At the end at
threads
Qtd. Gear Set Teeth
Drive Pinion
Location
Ring Gear
Location
5-37 = gear set has
a 5 -tooth drive pin-
ion and a 37 tooth
ring gear
At the end at
threads
On the front face or
outer diameter
Match Number
Drive Pinion
Location
Ring Gear
Location
M29 Pinion head
On the front face or
outer diameter
Pinion dimension (PC)
Variation value
Drive Pinion
Location
Ring Gear
Location
PC+3
Pinion head
On the outer
diameter
+2
+0,01 mm
PC-5
-1
-0,02 mm
ALTERNATE LOCATIONS
1 - PART NUMBER, TOOTH COMBINATION NUMBER,
GEAR SET MATCH NUMBER, PINION CONE VARIATION
NUMBER
2 - PART NUMBER, TOOTH COMBINATION NUMBER
3 -GEAR SET MATCH NUMBER, PINION CONE VARIATION
NUMBER
4 - PART NUMBER, TOOTH COMBINATION NUMBER,
GEAR SET MATCH NUMBER
5 - PART NUMBER, TOOTH COMBINATION NUMBER,
GEAR SET MATCH NUMBER
Figure 4.14