L82L5M9778112

3

New York City Transit New York - NYCT

LD64

9889

9889

L82L8M9778119

L82L8M9778119

1

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TOOLS REQUIRED:
•
•
•
•
•
•
•

Jig NT1090
Measuring Tape
Flathead screwdriver
10mm and 11mm socket wrench
Torque wrench
Torque seal
White sheet or cardboard

WARNING

Before proceeding with any adjustment, ensure that security stands are under the vehicle. Pressure in the
system must be a minimum of 120 psi (827 kPa).

NOTE

Make sure that the surface selected for the verification of the system is as level as possible.

1.1.

Run the bus.

1.2.

Make sure that there is sufficient air in the reservoirs (120 psi minimum at all times.) To do so, wait until
the pressure valve is released (engine running) or have continuous air supply.

1.3.

Park the vehicle on an even surface with the transmission on neutral.

1.4.

Apply the parking brake and set the master control switch to the stop position.

1.5.

Set the battery disconnect switch in the battery compartment to the off position

1.6.

Record the current height using the measuring tape at rear and front doors (See Figure 1).

Figure 1 - Measuring the Height of Front and Rear Doors
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1.7.

Raise the vehicle
NOTE

For more information on the raising and lowering of the vehicle, refer to section 18: HOISTING AND TOWING
of the Nova LFS maintenance manual. Respect your current internal safety procedures. Use the proper
hoisting equipment for your safety.
1.8.

If the wheels are not level between each other, adjust the lifts to allow the wheels to be level.

REAR LEVELING
1.9.

Locate the rear left air bag in front of the rear axle (See Figure 2).

Front of Bus

Figure 2 - Location of Rear Airbag

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1.10.

Using the jig NT1090, measure the distance from the air spring mounting plate and the bottom of the air
bag structure to which the air bag is attached (See Figure 3).

1.11.

Once the jig is in place, tighten the knob and remove the jig from the location.

NOTE

Make sure the jig is not touching the ridge of the frame and that the jig is flush. See picture of the incorrect
condition.

Figure 3 - Measurement of Air Springs - Rear

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1.12.

After removing the jig, measure the distance from the top of A to the bottom of B at the center of the jig using
a measuring tape (See Figure 4). Confirm that the plate x plate distance is within the specification shown
on table 1.
Center
A

Top of A

B

Bottom of B

Figure 4 - Measuring the Distance From Top A to Bottom B

Rear ride height Plate x Plate on lift specification

9 1/2" ± 1/4”

Minimum

9 ¼”

Maximum

9 ¾”

Table 1 - Plate Distance

1.13.

If the plate x plate measurement is not within specification, move on to the next step to adjust the rear plate
x plate height.

1.14.

Using a flathead screwdriver, loosen up the clamp attached to the top of the p-mount.

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1.15.

To increase the distance between the air spring mounting plates, slowly slide the p-mount downwards and
the rod upwards.

1.16.

To decrease the distance between the air spring mounting plates, slowly slide the p-mount upwards and the
rod downwards (See Figure 5).
NOTE

Let the pneumatic system settle roughly 5 minutes before taking measurements between the air spring
mounting plates.

Clamp
P-mount
Rod

Figure 5 - Location of Airspring Mounting Plates

NOTE

The p-mount arm must be even with the p-mount or protrude slightly. It should never be inside the p-mount.

Once the leveling is
complete, the p-mount
arm must be even with
or protrude slightly from
the p-mount

Figure 6 - View of P-mount arm

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1.17.

FT5329

Recheck the ride height on the airbag and once the height specification is achieved, tighten the clamp.

NOTE

Do not over-tighten to avoid damaging the p-mount.

NOTE

To get more adjustment, it’s possible to invert the position (flip) of the P-mount and tighten the clamps over
the knurled area.
(P-MOUNT inverted)

KNURLED AREA
P-MOUNT

(P-MOUNT not inverted)

KNURLED AREA

P-MOUNT

Figure 7 - Knurled Area of P-mount

1.18.

Repeat the steps 1.8 to 1.16 for the right rear side.

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FRONT LEVELING
1.19.

Locate the front left air bag (See Figure 8).

Front of Bus

Figure 8 - Location of Front Airbag

1.20.

Using the jig NT1090, measure the distance from the air spring mounting plate and the bottom of the air
bag structure to which the air bag is attached.

1.21.

Once the jig is in place, tighten the knob and remove the jig from the location (See Figure 9).

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Figure 9 - Measurement of Air Springs - Front

NOTE

Make sure the jig is not touching any plate hardware and confirm that the jig is flush. See picture of potential
hardware interference.

Hardware to clear

Figure 10 - Location of Hardware

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1.22.

After removing the jig, measure the distance from the top of A to the bottom of B at the center of the jig using
a measuring tape. Confirm that the plate x plate distance is within the specification shown on table 2.

Figure 11 - Measuring the Distance from Top A to Bottom B
NOTE

If the measurement is not within specification, document the measurement.

Front Ride Height Plate x Plate on lift specification

11 7/8" ± 1/8"

Minimum

11 ¾”

Maximum

12”

Table 2 - Plate Distance

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1.23.

Repeat steps 14-16 for the front right side.

1.24.

If the front left and the front right plate x plate measurements are not within specification, move on to the next
step to adjust both of the front plate x plate heights.

1.25.

Locate the center front leveling valve and remove the dust cover using a 10mm socket wrench (See Figure 12).

Figure 12 - Location of Center Front Leveling valve

1.26.

Confirm that the arm and bracket on the front leveling valve is 90deg and straight. If the arm and bracket are
not 90deg and straight (See Figure 13).

•

Loosen the M6 bolt using a 10mm socket wrench

•

Adjust the arm and bracket to be 90deg and straight

•

Tighten the bolt to 8.1 ± 0.75 lb ft (11 ± 1Nm) using a torque wrench and 10mm socket. Apply torque seal.

Torque 8.1± 0.75 lb-ft (11 ± 1Nm)

This Arm and
bracket must be
verified as straight
and at 90 degrees

M16 Bolt

Figure 13 - Angle between the Arm and Bracket

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1.27.

Using a 11mm socket wrench, loosen up the 2x bolts on the center leveling valve. While facing the streetside
of the bus, adjust the front right and left plate x plate height (See Figure 14).

•

Push the valve towards the front of the bus along the slot to increase/inflate the air springs.

•

Push the valve towards the rear of the bus along the slot to decrease/deflate the air springs.

2 x hardware to
loosen up

Front of Bus

Figure 14 - Loosening the bolts on the Center Leveling Valve

1.28.

Re-measure the front left and front right air spring plate x plate measurement using the jig to confirm if the
height is within specification.

NOTE

Let the pneumatic system settle roughly 5 minutes before taking measurements between the air spring
mounting plates.
1.29.

If the FRONT plate x plate heights were adjusted and cannot meet specification with the leveling valve adjusted
to max, adjust the REAR plate x plate measurement by returning to step 1.14 to1.18.

NOTE

The rear left and rear right measurements may become out of specification when the front left and
front right measurements become in specification. This is acceptable if the front measurements are within
specification.

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1.30.

Re-measure the front left and front right air bag heights using the jig. Once the front right and front left plate
x plate measurements are within specification, tighten the 2x bolts on the front leveling valve and torque to
3.7-4.4 lb ft (5-6 N●m) using a torque wrench and 11mm socket. Apply torque seal (See Figure 15).

Torque
ft lb lb-ft
(5-6 Nm)
Torque3.7-4.4
3.7-4.4
(5-6

N●m)

Figure 15 - Tightening the bolts

1.31.

Reinstall the dust cover over the front center leveling valve.

1.32.

Lower the vehicle.

APPENDIX – REFERENCE MEASUREMENTS
Refer to table 3 for reference vehicle front wheelchair ramp x ground height using a measuring tape.

NOTE

This height is only for reference purposes as the measurement is subjective based on the ground measuring
from the table.

Front ride height wheelchair ramp x ground
specification

15 1/4” ± 1/4”

Minimum

15”

Maximum

15 ½”

Table 3 - Ground Measuring

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APPENDIX - KNEELING SYSTEM
NOTE

Make sure that the surface selected for the verification of the kneeling system is as level as possible.