SERVICE MANUAL BULLETIN
This Service Manual Bulletin is prepared by the Publications Department of New Flyer Industries
Canada ULC. Refer to details below.

SMB-188
ISSUE DATE: Sep 20 2019

APPLICABILITY
VEHICLE LENGTH

 30ft.

 35ft.

 40ft.

 60ft.

 Xcelsior®

 MiDi®

 Invero®

 Low Floor

 High Floor

 Diesel

 Diesel/Electric

 CNG

 Fuel Cell

 Trolley/Electric

 Battery/Electric

 ALL

VEHICLE TYPE

FUEL TYPE

 ALL

 LNG
 ALL

SUBJECT

Belt Driven Scroll Air Compressor - Powerex

SECTION TITLE

PM - PREVENTIVE MAINTENANCE

DETAILS

This bulletin provides revised information for the Preventive Maintenance
on the Powerex Belt Driven air compressor.
This information supersedes any prior information on this subject
already provided in your New Flyer Service Manual.
Make this Service Bulletin available to service personnel to inform them
of changed information.

SMB-188

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2019 New Flyer Industries Canada ULC

1 of 8

SERVICE MANUAL BULLETIN
SMB-188
1.

BELT DRIVEN SCROLL
COMPRESSOR

1.1.

Preventive Maintenance Guide

Intervals listed in this bulletin were converted from compressor operating hours to
mileage using an average vehicle speed of
12.5 mph and a compressor duty cycle of
50%. Adjust the service interval according
to actual operating conditions.

Intervals are based on the manufacturer’s
recommendations which are expressed in
compressor operating hours.

Compressors operating in a hot dusty environment will need more frequent servicing.

PREVENTIVE MAINTENANCE GUIDE
12,000 mi.
(19,300 km)

Yearly

Compressor Air
Filter Inspection
(500 hrs.)

Compressor Orbital
Scroll Bearing
Lubrication

60,000 mi.
(96,560 km)
Compressor Air
Filter Replacement
(2,500 hrs.)

120,000 mi.
(193,000 km)

250,000 mi.
(402,330 km)

Compressor Fan &
Duct Seal Cleaning
(5,000 hrs.)

Compressor Tip &
Dust Seal
Replacement
(10,000 hrs.)

Fixed Scroll Fin
Cleaning (2,500 hrs.)

Crank Pin Bearing
Lubrication
(10,000 hrs.)
Heat Insulation
Pipe Replacement
(10,000 hrs.)

1.2.

12,000 Miles (19,300 km)
Preventive Maintenance

set to the OFF position and locked-out
and tagged-out.

1.2.1.

Compressor Air Filter Inspection

Lubricate the orbital scroll (OS) bearing
yearly. Lubricate the bearing in the spring
before the high summer temperatures.

Inspect the air compressor air filter element.
1. Remove air filter cover.
2. Inspect filter element for contamination.
3. Reinstall filter element and replace cover.

1.3.

Yearly Preventive Maintenance

1.3.1.

Compressor Orbital Scroll Bearing
Lubrication

If the compressor needs to be removed
from the vehicle to access the lubrication
port, refer to Section 8 of your New Flyer
Service Manual for removal procedure.
1. Wipe off around dust cap. Remove plastic
dust cap for orbital scroll bearing grease
fitting. See “Fig. 1: Orbital Scroll Bearing
Lubrication” on page 3.
2. Rotate compressor pulley until grease fitting lines up with lubrication port.
3. Obtain a grease gun kit with special adapters and grease.

Maintenance of high voltage equipment
must be performed by qualified personnel only. Refer to your New Flyer Service Manual for safety requirements.
Ensure that the High Voltage Interlock
and Battery Disconnect switches are

2 of 8

☞NOTE:

Contact New Flyer Parts for information on
the grease gun kit with special adapters
and grease cartridge.

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2019 New Flyer Industries Canada ULC

SMB-188

SERVICE MANUAL BULLETIN
SMB-188

☞NOTE:

Pump grease gun to eliminate air from the
extension adapter before use.
4. Apply three full pumps of the grease gun to
deliver the correct amount of grease to the
bearings.

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3257

☞NOTE:

Each pump of the grease gun delivers 0.65
grams of grease.
5. Remove grease gun and reinstall plastic
dust cap.

1.4.

60,000 Miles (96,560 km)
Preventive Maintenance

1.4.1.

Compressor Air Filter Replacement (if
equipped)

❒ Replace the air filter element.
1.4.2.

Fixed Scroll Fin Cleaning

❒ Remove the fixed scroll cover and clean
the cooling fins using compressed air. See
“Fig. 2: Scroll Compressor Filter Replacement” on page 3.

1.5.

120,000 Miles (193,500 km)
Preventive Maintenance

1.5.1.

Air Compressor Cleaning, Lubrication
& Parts Replacement

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Fig. 1: Orbital Scroll Bearing Lubrication

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Maintenance of high voltage equipment
must be performed by qualified personnel only. Refer to your New Flyer Service Manual for safety requirements.
Ensure that the High Voltage Interlock
and Battery Disconnect switches are
set to the OFF position and locked-out
and tagged-out.
1.5.2.

Compressor Fan & Duct Seal Cleaning
Remove the blower fan cover and clean
the compressor fins and fan using compressed air. Wipe the fan duct interior with
a clean cloth.
s0700574a.svg

Fig. 2: Scroll Compressor Filter Replacement

SMB-188

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2019 New Flyer Industries Canada ULC

3 of 8

SERVICE MANUAL BULLETIN
SMB-188
1.6.

250,000 Miles (402,330 km)
Preventive Maintenance

1.6.1.

Crank Pin Bearing Lubrication