Meritor MS1913X - Checking the Ratio in the Event of a Damaged Axle Tag; Verify the Actual Gear Set Ratios

4 Prepare Parts for Assembly
22
Meritor Maintenance Manual MM-15103 (Issued 07-17)
Gear Set Tooth Combination Number
Gear Set Match Number
NOTE: Meritor drive pinions and ring gears are only available as
matched sets. Each gear in a set has an alphanumeric match
number.
Pinion Cone Variation Number
NOTE: Don’t use the pinion cone variation number when you check
for a matched gear set. Use this number when you adjust the pinion
depth in the carrier. Refer to Section 5.
Checking the Ratio in the Event of a
Damaged Axle Tag
To Identify the Gear Teeth Number on the Rear Axle
Drive Pinion
WARNING
Park the vehicle on a level surface. Block the wheels to
prevent the vehicle from moving. Support the vehicle with
safety stands. Do not work under a vehicle supported only by
jacks. Jacks can slip and fall over. Serious personal injury and
damage to components can result.
1. Park the vehicle on a level surface.
2. Block the wheels to prevent the vehicle from moving.
3. Remove the drive shaft. Refer to the vehicle manufacturer’s
procedures.
4. Identify and record the gear set teeth numbers stamped on the
end of the rear axle drive pinion. Figure 4.14.
Figure 4.14
5. Calculate the gear set ratio by dividing the larger number by
the smaller number. Figure 4.14.
Verify the Actual Gear Set Ratios
You can check the actual gear set ratios when you remove the
differential carriers from the axle housings for service or repair.
Refer to the following procedure to calculate the actual gear set
ratios.
1. Count the number of ring gear teeth. Figure 4.15.
Gear Set Teeth
Drive Pinion
Location
Ring Gear
Location
5-37 = gear set has
a five-tooth drive
pinion and a
37-tooth ring gear
At the end at
threads
On the outer
diameter
Match Number
Drive Pinion
Location
Ring Gear
Location
M29 At the end of the
gear head
On the outer
diameter
Pinion Cone (PC)
Variation Number
Drive Pinion
Location
Ring Gear
Location
PC+3
+2
+0.01 mm
PC–5
–1
–0.02 mm
At the end of the
pinion gear head
On the outer
diameter
Figure 4.14
4012513a
LARGER NUMBER
SMALLER NUMBER
= GEAR SET RATIO
10
47
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