INSTRUCTION TO SERVICE
ITS: 6572
SECTION:

204

WRITTEN BY:

Tyler Omichinski

SUBJECT:

Torque Inspection of ZF Center Axle Hub/Rotor Bolts

Rear Suspension

ITS6572

THIS DOCUMENT AND THE CONTENTS DISCUSSED HEREIN ARE THE CONFIDENTIAL AND
PROPRIETARY INFORMATION OF NEW FLYER INDUSTRIES CANADA ULC AND NEW FLYER OF
AMERICA INC. AND ARE DISCLOSED BY NEW FLYER IN CONFIDENCE. THIS DOCUMENT AND THE
CONTENTS HEREIN ARE NOT TO BE DISCLOSED BY THE INTENDED RECIPIENT WITHOUT THE PRIOR
WRITTEN AUTHORIZATION OF NEW FLYER. ANY UNAUTHORIZED DISCLOSURE, REPRODUCTION OR
OTHER DISTRIBUTION OF THIS DOCUMENT OR INFORMATION IS STRICTLY PROHIBITED AND MAY
RESULT IN ACTION BEING TAKEN AGAINST THE PARTY MAKING THE UNAUTHORIZED DISCLOSURE.
THIS DOCUMENT AND ALL COPIES HEREOF MUST BE RETURNED TO NEW FLYER UPON REQUEST.

PROCEDURE:



NOTE:

The results of this inspection are to be recorded on the inspection sheet at the end of this
document and forwarded to your local New Flyer Regional Product Support Manager.

1. Turn the main battery disconnect switch to the “OFF” position. Ensure that the park brake is applied.
2. Record vehicle information on the inspection check sheet.
3. Record the center axle serial number on the inspection check sheet. The axle serial number is located on a
data plate which is mounted to the rear of the axle beam, as shown in Fig. 1. If required to access the data
plate, raise coach in accordance with the New Flyer Service Manual. Use jack stands as appropriate if lifting
equipment will obstruct the view of the axle beam.

Figure 1: Location of center axle data plate
4. If necessary, lower coach in accordance with the New Flyer Service Manual.
5. Perform a visual inspection of the connection between the center axle brake rotor and wheel hub. The affected
connection is shown in Fig. 2. Note any signs of damage on the inspection check sheet.

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ITS: 6572
Page 2 of 5

Figure 2: Center axle rotor/hub mating bolts to be inspected
6. Perform a torque inspection of the rotor bolts as follows, one at a time. Record the results in the inspection
check sheet:
a.

Attempt to loosen the bolt by hand. If the bolt can be turned by hand, record the bolt as “loose”.

b.

If the bolt cannot be turned by hand, torque the bolt to 300 N.m (221 ft-lbs).


If the bolt rotates more than 90 degrees before reaching the torque specification, mark the bolt as
“loose”



Otherwise, mark the bolt as “torqued”

c.

Repeat the procedure and document the results for all 10 bolts on each center axle rotor

d.

If any bolt is found loose, replace it with a new bolt (NF P/N 6407926). Torque the bolt to 300 N.m (221 ftlbs) dry.

7. Mark all fasteners with a torque stripe after completing the torque audit. The torque stripe should extend from
the fastener to the mating surface of the hub.
8. Turn the main battery disconnect switch to the “ON” position.
9. Send each vehicle’s completed inspection sheet to your local New Flyer Regional Product Support Manager.

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ITS: 6572
Page 3 of 5

LABOUR ESTIMATE
Operation
1

Inspect center axle rotor bolts and complete inspection sheet

Men

Hours

1

1.0

Labour Time
M X HR
1.0

PARTS REQUIRED
Item

Part Number

1

6407926

Description
SCREW HEX M16X1.5.80

Qty.
per
Coach
20

Units

Notes

EA

AS REQUIRED

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ITS: 6572
Page 4 of 5

Rotor Bolt Inspection Checksheet for ZF A-132 Axle
Vehicle Information
OEM New Flyer
Customer
Vehicle Number
VIN
Date In Service
/
Mileage
Axle Model AVN 132
Axle Part Number 4
4
7
Axle Serial Number
A. Visual Inspection
Right
Left

/
KM
2

.

MI

Hub Temp
#1
#2

.

Any signs of damage? If so, comment:

B. Rotor Bolt Torque
When verifying the torque on the rotor bolts, please start by checking to see if the bolts are hand tight. If so,
please mark respective bolts as "loose". If you cannot loosen by hand, set the torque wrench to 300Nm and
torque the bolts with 221 lbf. Ft (300 NM) Hex screw M16*1,5 / 10.9. If there is significant movement, mark
respective bolt as "loose". If not, mark respective bolt as "torqued".
Right
(check 'X') loose
(check 'X') torqued

1

2

3

4

5

6

7

8

9

10

Left
(check 'X') loose
(check 'X') torqued

1

2

3

4

5

6

7

8

9

10

1
10

2
3

9

4
8
5

7
6