HAC Air Kits
SUBJECT: Installation, Maintenance and
Operation Procedures
LIT NO: OM-H719
DATE: August 2018
REVISION: D
TABLE OF CONTENTS
Section 1

Introduction. . . . . . . . . . . . . . . . . . . . . . 2

Section 2

Product Description. . . . . . . . . . . . . . . . 2

Section 3

Important Safety Notice. . . . . . . . . . . . . 4

Section 4

HAC Air Kit Components . . . . . . . . . . . . 8

Section 5

Installation
Installation Instructions. . . . . . . . . . . . . 11
Installation Tips . . . . . . . . . . . . . . . . . . 12

Section 6

Plumbing & Wiring Diagram . . . . . . . . 13

Section 7

Suspension Operation
Raising your Lift Axle. . . . . . . . . . . . . . . 16
Lowering your Lift Axle . . . . . . . . . . . . . 16

Section 8

Preventive Maintenance
Hendrickson Recommended
Maintenance Intervals . . . . . . . . . . . 17

Section 9

Tech Tips. . . . . . . . . . . . . . . . . . . . . . . . 17

Section 10 Frequently Asked Questions. . . . . . . . . 18
Section 11 Troubleshooting Guide. . . . . . . . . . . . . 19

HAC Air Kits
SECTION 1

Introduction
This publication is intended to acquaint and assist personnel with the installation, service, maintenance,
and operation of Hendrickson HAC Air Kits on vehicles equipped with Hendrickson Auxiliary Lift Axle
Suspensions.
NOTE

Use only Hendrickson Genuine Parts for servicing this suspension system.
It is important to read and understand this entire publication prior to performing any installation, service,
maintenance, and operation of the product. The information in this publication contains product images,
safety information, product specifications, features and instructions for proper installation, service,
maintenance, and operation of Hendrickson HAC Air Kits.
Hendrickson reserves the right to make changes and improvements to its products and publications
at any time. Contact Hendrickson Tech Services for information on the latest version of this manual at
1-800-660-2829 (toll-free U.S. and Canada), 1-740-929-5600 (Outside U.S. and Canada), or e-mail:
liftaxle‌@‌hendrickson‑intl.com.
The latest revision of this publication is also available online at www.hendrickson-intl.com.

SECTION 2

Product Description
HAC SERIES LIFT AXLE CONTROLS are designed to accommodate a variety of lift axle applications and
lift axle control requirements. The controllers are made up of a pneumatic valve assembly that is packaged together with a pressure regulator, dial indicator gauge, and push / pull knob. The regulator controls
the pressure in the lift axle ride bags. The dial indicator reports the pressure the regulator is set to. The
push / pull knob controls the state of the lift axle, either deployed or retracted. The kits are differentiated by
the position of components and a variety of additional components which optimize the system to meet a
variety of lift axles, regulations, and chassis requirements. One air kit is required per lift axle.
Refer to Table 2-1 to review the standard lift axle Air Control Kits categorized by the control mounting location and lift axle application.
NOTE

State / Provincial law regulates the mounting location for the lift axle controls. Refer to the Department of
Transportation requirements for the state or province that the vehicle will be operating in prior to selecting
a control. Maryland has specific requirements that the HAC-MSO was specifically designed to meet.

AIR CONTROL KITS

LIFT AXLE
APPLICATION

TABLE 2-1

Introduction

INSIDE-MOUNTED

OUTSIDE-MOUNTED
(COMPOSITE)

OUTSIDE-MOUNTED
(STAINLESS)

Steerable

HAC-SSI

HAC-UCO

HAC-USO

Non-Steerable

HAC-NSI

HAC-UCO

HAC-USO

Reverse Lift & Lock

HAC-LSI

HAC-LCO

HAC-LSO

Reverse Down & Lock

HAC-RSI

HAC-RCO

HAC-RSO

Reverse Caster

HAC-ASI

HAC-ACO

HAC-ASO

2

OM-H719

HAC Air Kits
HAC Series Lift axle controls designed for steerable axles include a Solenoid Valve that can be wired to
provide lift in reverse functionality. Steerable axles must be lifted when moving in reverse or locked from
turning to prevent damage to the axle / suspension. Steerable axles including a lock straight feature require
additional components found in the kits from the Reverse Lift & Lock or Reverse Down & Lock rows of Table
2-1. Steerable axles designed to be able to reverse their caster angle and steer in reverse require additional
components found in the kits from the Reverse Caster row of Table 2-1.
Outside-Mounted HAC Series lift axle controls are also included with an Electric Override Switch.The Electric
Override Switch is intended to be installed in the cab to give drivers temporary override control without
exiting the vehicle. When the override switch is powered ON it will override the push / pull knob position on
controller to temporarily lift the axle. When the switch (or vehicle) is powered OFF the axle will redeploy to
match the state of the push / pull knob in the control box. Lift in reverse functionality is maintained using the
relay provided in the kit. Outside-Mounted lift axle controls are also offered in either a composite plastic or
stainless steel package.
Exceptions include the following. Refer to Hendrickson customer service for additional information.
■■

HAC-MCA kit – For steerable or non-steer axles. An outside-mounted composite enclosure containing the
valve assembly, regulator and gauge. A separate Electric Switch is intended to be mounted in the cab to
control the state of the axle.This kit does not include a push / pull knob.This kit also provides lift in reverse
functionality. The HAC-MCA is designed to lift the axle automatically upon turning the truck off.

■■

HAC-DSI Kit – For certain tag axle applications on chassis with Power Take-off (PTO). An inside-mounted
steel enclosure containing the valve assembly, two (2) regulators and two (2) gauges for controlling
one (1) lift axle. A separate Electric Switch is intended to be mounted in the cab to control the state
of the axle. One (1) regulator controls the normal running pressure of the lift axle ride bags and the
second can be set to control the lift axle ride bags to an alternate pressure when the system senses a
PTO is powered on.

STANDARD COMPONENTS
All air kits come standard with one (1) Pressure protection valve, one (1) Quick-Exhaust valve and one (1)
In‑line filter for a single lift axle application.

OPTIONAL COMPONENTS

FIGURE 2-1

The following options will facilitate or enhance the installation and the operation
of your air kit:

OM-H719

■■

Brake Release Valve – Part No. R-001994, A pilot valve used to allow auxiliary
lift axle brakes, to apply normally when the suspension is in the DOWN position. However, when the auxiliary lift axle is in the UP position, the brakes are
released to eliminate hang-ups during high centering and to conserve system
air pressure, see Figure 2-1.

■■

Mounting Bracket – A single, double or L-shape mounting bracket designed to
mount a HAC-SSI or HAC-NSI panel inside the cab, refer to Figure 4-3.

■■

Quick-Exhaust Valve – Two (2) pieces of Part No. R-004348 can mount to the
ride spring air inlet port as an alternate or addition to the Quick‑Exhaust valve
included in the kit, R-004348-1.

3

Product Description

HAC Air Kits
SECTION 3

Important Safety Notice
Proper maintenance, service, and repair is important for the reliable operation of the suspension. The
procedures recommended by Hendrickson and described in this technical publication are methods of
performing such maintenance, service and repair.
All safety‑related information should be read carefully to help prevent personal injury and to assure that
proper methods are used. Improper servicing may damage the vehicle, cause personal injury, render it
unsafe for operation, or void manufacturer’s warranty.
Failure to follow the safety precautions in this manual can result in personal injury and / or property damage.
Carefully read and understand all safety related information within this publication, on all decals and in all
such materials provided by the vehicle manufacturer before conducting any maintenance, service or repair.
■■

EXPLANATION OF SIGNAL WORDS

Hazard “Signal Words” (Danger-Warning-Caution) appear in various locations throughout this publication.
Information accented by one of these signal words must be observed to help minimize the risk of personal
injury to service personnel, or the possibility of improper service methods, which may damage the vehicle
or render it unsafe.
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey
all safety messages that follow this symbol to avoid possible injury or death.
Additional Notes or Service Hints are utilized to emphasize areas of procedural importance and
provide suggestions for ease of repair. The following definitions indicate the use of these signal words as
they appear throughout the publication.
INDICATES AN IMMINENTLY HAZARDOUS SITUATION, WHICH, IF NOT AVOIDED, WILL RESULT IN SERIOUS INJURY
OR DEATH.
INDICATES A POTENTIAL HAZARDOUS SITUATION, WHICH, IF NOT AVOIDED, CAN RESULT IN SERIOUS INJURY OR
DEATH.
INDICATES A POTENTIAL HAZARDOUS SITUATION, WHICH, IF NOT AVOIDED, MAY RESULT IN MINOR OR MODERATE
INJURY.

NOTE

An operating procedure, practice condition, etc. which, is essential to emphasize.

SERVICE HINT

A helpful suggestion that will make the servicing being performed a little easier and / or faster.

The torque symbol alerts you to tighten fasteners to a specified torque value. Refer to Torque
Specifications section of this publication.

Important Safety Notice

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HAC Air Kits
■■

SAFETY PRECAUTIONS

LIFT AXLE RAPID MOVEMENT
LIFT AXLE RAPID MOVEMENT CAN CAUSE SEVERE PERSONAL INJURY OR DEATH.
IF LIFT AXLE IS OPERATED BY AN AUTOMATIC OR SEMI‑AUTOMATIC LIFT AXLE CONTROL SYSTEM, SUCH SYSTEM
MAY CAUSE LIFT AXLE TO AUTOMATICALLY RAISE OR LOWER UNDER DIFFERENT CONDITIONS.
LIFT AXLE ACTIVATION AND MOVEMENT MAY VARY DEPENDING ON THE BRAND, CONFIGURATION, AND
OPERATING CONDITION OF THE LIFT AXLE CONTROL SYSTEM AND / OR OTHER FACTORS. READ, UNDERSTAND,
AND COMPLY WITH ALL APPLICABLE OPERATING INSTRUCTIONS AND SAFETY INFORMATION PROVIDED BY THE
LIFT AXLE CONTROL SYSTEM MANUFACTURER AND VEHICLE MANUFACTURER.
ENSURE ALL PERSONNEL ARE CLEAR OF LIFT AXLE BEFORE AND DURING VEHICLE LOADING AND LIFT AXLE
ACTIVATION UP OR DOWN.
LIFT AXLE ACTIVATION
DO NOT LOWER LIFT AXLE WHILE THE VEHICLE IS MOVING IN REVERSE OR TRAVELING AT MORE THAN 15 MPH.
FAILURE TO DO SO CAN CAUSE COMPONENT DAMAGE.
REVERSE LOCKOUT OPERATION
DO NOT ACTUATE STEERABLE LIFT AXLE REVERSE LOCKOUT FEATURE (IF EQUIPPED) WHILE VEHICLE IS TURNING.
FAILURE TO DO SO CAN CAUSE COMPONENT DAMAGE.
BEFORE TRAVELING IN REVERSE:
• ENSURE STEERABLE LIFT AXLE REVERSE LOCKOUT FEATURE (IF EQUIPPED) IS PROPERLY ACTUATED.
• RAISE ALL STEERABLE LIFT AXLES NOT EQUIPPED WITH REVERSE LOCKOUT FEATURE.
FAILURE TO DO SO CAN CAUSE COMPONENT DAMAGE.
REVERSE CASTER OPERATION
DO NOT LOWER STEERABLE LIFT AXLE EQUIPPED WITH REVERSE CASTER FEATURE WHILE VEHICLE IS MOVING
IN REVERSE. FAILURE TO DO SO CAN CAUSE COMPONENT DAMAGE.
LOAD CAPACITY
ADHERE TO THE PUBLISHED CAPACITY RATINGS FOR THE AUXILIARY AXLES. ADD-ON AXLE ATTACHMENTS (I.E.
SLIDING FIFTH WHEELS) AND OTHER LOAD TRANSFERRING DEVICES CAN INCREASE THE AUXILIARY AXLES
LOAD ABOVE THE RATED AND APPROVED CAPACITIES WHICH CAN RESULT IN FAILURE AND ADVERSE VEHICLE
HANDLING, POSSIBLY CAUSING PERSONAL INJURY OR PROPERTY DAMAGE.
DAILY / PRE-TRIP OPERATOR INSPECTION
DAILY (AND BEFORE EACH TRIP) INSPECT ALL LIFT AXLE COMPONENTS FOR PROPER OPERATING CONDITION
AND PROPER INSTALLATION TO THE TRUCK / TRAILER FRAME. THIS ESSENTIAL DAILY / PRE-TRIP OPERATOR
INSPECTION MUST ALSO INCLUDE A VISUAL INSPECTION OF ALL WHEEL SEALS AND GASKETS FOR LEAKS,
A VERIFICATION OF PROPER OIL LEVEL IN THE HUBS (IF APPLICABLE), INSPECTION OF ALL LIFT AND RIDE
AIR‑SPRINGS FOR WEAR, AND INSPECTION OF ALL TIRES FOR PROPER INFLATION AN ABNORMAL WEAR
PATTERNS. IDENTIFY AND REPAIR / REPLACE ANY LOOSE, DAMAGED OR IMPROPERLY INSTALLED COMPONENTS.
REFER TO THE CURRENT VERSION OF HENDRICKSON PUBLICATION NO. TP-H621 FOR ADDITIONAL SERVICE,
REPAIR, AND REBUILD INSTRUCTIONS.
REPAIR AND RECONDITIONING
THE REPAIR OR RECONDITIONING OF AUXILIARY AXLE COMPONENTS THAT ARE BENT, DAMAGED OR OUT
OF SPECIFICATION IS NOT ALLOWED. ANY AXLE COMPONENTS FOUND TO BE DAMAGED OR OUT OF
SPECIFICATION, MUST BE REPLACED. AXLE COMPONENTS CANNOT BE BENT, WELDED, HEATED, OR REPAIRED
WITHOUT REDUCING THE STRENGTH OR LIFE OF THE COMPONENT. FAILURE TO FOLLOW THESE GUIDELINES
CAN CAUSE ADVERSE VEHICLE HANDLING, POSSIBLE PERSONAL INJURY, DEATH, OR PROPERTY DAMAGE AND
WILL VOID APPLICABLE WARRANTIES.

OM-H719

5

Important Safety Notice

HAC Air Kits
AIR SPRINGS
PRIOR TO AND DURING DEFLATION AND INFLATION OF THE AIR SUSPENSION SYSTEM, ENSURE THAT ALL
PERSONNEL AND EQUIPMENT ARE CLEAR FROM UNDER THE VEHICLE AND AROUND THE SERVICE AREA, FAILURE
TO DO SO CAN CAUSE SEVERE PERSONAL INJURY, DEATH, OR PROPERTY DAMAGE.
AIR SPRINGS
EXHAUST ALL PRESSURE IN LIFT AXLE AIR SPRINGS AND VEHICLE AIR SYSTEM BEFORE WORKING ON OR
AROUND LIFT AXLE. FAILURE TO DO SO CAN CAUSE SEVERE PERSONAL INJURY OR DEATH.
AIR SPRINGS
INFLATE THE SUSPENSION SLOWLY AND MAKE SURE THE RUBBER BLADDER OF THE AIR SPRING INFLATES
UNIFORMLY AND IS NOT BINDING. FAILURE TO DO SO CAN CAUSE DAMAGE TO THE AIR SPRING AND / OR
MOUNTING BRACKETS AND WILL VOID APPLICABLE WARRANTIES.
AIR SPRINGS
AIR SPRING ASSEMBLIES MUST BE DEFLATED PRIOR TO LOOSENING ANY ADJACENT HARDWARE.
UNRESTRICTED AIR SPRING ASSEMBLIES CAN VIOLENTLY SHIFT. DO NOT INFLATE AIR SPRING ASSEMBLIES
WHEN THEY ARE UNRESTRICTED. AIR SPRING ASSEMBLIES MUST BE RESTRICTED BY SUSPENSION OR
OTHER ADEQUATE STRUCTURE. DO NOT INFLATE BEYOND PRESSURES RECOMMENDED BY AIR SPRING
MANUFACTURER. CONTACT HENDRICKSON TECHNICAL SERVICES FOR DETAILS. IMPROPER USE OR OVER
INFLATION MAY CAUSE AIR SPRING ASSEMBLIES TO BURST, CAUSING PROPERTY DAMAGE AND / OR SEVERE
PERSONAL INJURY.
FASTENERS
DISCARD USED FASTENERS. ALWAYS USE NEW FASTENERS TO COMPLETE A REPAIR. FAILURE TO DO SO COULD
RESULT IN FAILURE OF THE PART OR MATING COMPONENTS, ADVERSE VEHICLE HANDLING, PERSONAL INJURY,
OR PROPERTY DAMAGE.
LOOSE OR OVER-TORQUED FASTENERS CAN CAUSE COMPONENT DAMAGE, ADVERSE VEHICLE HANDLING,
PROPERTY DAMAGE, OR SEVERE PERSONAL INJURY. MAINTAIN CORRECT TORQUE VALUE AT ALL TIMES. CHECK
TORQUE VALUES ON A REGULAR BASIS AS SPECIFIED, USING A REGULARLY CALIBRATED TORQUE WRENCH.
TORQUE VALUES SPECIFIED IN THIS TECHNICAL PUBLICATION ARE FOR HENDRICKSON SUPPLIED FASTENERS
ONLY. IF NON‑HENDRICKSON FASTENERS ARE USED, FOLLOW TORQUE SPECIFICATIONS LISTED IN THE VEHICLE
MANUFACTURER’S SERVICE MANUAL.
MODIFYING COMPONENTS
DO NOT MODIFY OR REWORK PARTS WITHOUT AUTHORIZATION FROM HENDRICKSON. DO NOT SUBSTITUTE
REPLACEMENT COMPONENTS NOT AUTHORIZED BY HENDRICKSON. USE OF MODIFIED, REWORKED,
SUBSTITUTE OR REPLACEMENT PARTS NOT AUTHORIZED BY HENDRICKSON MAY NOT MEET HENDRICKSON’S
SPECIFICATIONS, AND CAN RESULT IN FAILURE OF THE PART, ADVERSE VEHICLE HANDLING, POSSIBLE PERSONAL
INJURY OR PROPERTY DAMAGE, AND WILL VOID APPLICABLE WARRANTIES. USE ONLY HENDRICKSONAUTHORIZED REPLACEMENT PARTS.
THE VEHICLE MANUFACTURER SHOULD BE CONSULTED BEFORE MAKING ANY CHANGES TO THE VEHICLE’S
FRAME. TYPICALLY, CUTTING OR ALTERING THE VEHICLE’S FRAME OR SIDE RAIL IS NOT PERMITTED AND MAY
AFFECT THE MANUFACTURER’S WARRANTY COVERAGE.
ANY INSTALLATION DEVIATIONS MUST BE APPROVED IN WRITING BY HENDRICKSON’S PRODUCT ENGINEERING
DEPARTMENT. FAILURE TO COMPLY WITH ANY OF THE ABOVE WILL VOID APPLICABLE WARRANTIES.
IMPROPER JACKING METHOD
IMPROPER JACKING METHOD CAN CAUSE STRUCTURAL DAMAGE AND RESULT IN ADVERSE VEHICLE HANDLING,
SEVERE PERSONAL INJURY OR DEATH. DO NOT USE AXLE BEAM OUTBOARD OF AXLE SPRING SEATS. REFER TO
VEHICLE MANUFACTURER FOR PROPER JACKING INSTRUCTIONS.
OFF ROADWAY TOWING
HENDRICKSON DOES NOT RECOMMEND TOWING A VEHICLE BY THE AUXILIARY AXLE. DOING SO WILL DAMAGE
THE AXLE AND WILL VOID APPLICABLE WARRANTIES.
Important Safety Notice

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HAC Air Kits
PROCEDURES AND TOOLS
A MECHANIC USING A SERVICE PROCEDURE OR TOOL, THAT HAS NOT BEEN RECOMMENDED BY HENDRICKSON,
MUST FIRST SATISFY HIMSELF THAT NEITHER HIS SAFETY NOR THE VEHICLE’S SAFETY WILL BE JEOPARDIZED
BY THE METHOD OR TOOL SELECTED. INDIVIDUALS DEVIATING IN ANY MANNER FROM THE INSTRUCTIONS
PROVIDED ASSUME ALL RISKS OF POTENTIAL PERSONAL INJURY OR DAMAGE TO EQUIPMENT INVOLVED.
PERSONNEL PROTECTIVE EQUIPMENT
ALWAYS WEAR PROPER EYE PROTECTION AND OTHER REQUIRED PERSONAL PROTECTIVE EQUIPMENT TO HELP
PREVENT PERSONAL INJURY WHEN YOU PERFORM VEHICLE MAINTENANCE, REPAIR OR SERVICE.
DAMAGED AXLE COMPONENTS
IF A VEHICLE EQUIPPED WITH A HENDRICKSON AUXILIARY AXLE IS INVOLVED IN A CRASH, A THOROUGH
INSPECTION OF THE AXLE MUST BE PERFORMED NOTING THE CONDITION OF THE AXLE BEAM, KINGPINS, AND
KNUCKLE ASSEMBLIES, INCLUDING THE AREAS OF AXLE-TO-KINGPIN INTERFACE, FOR ANY DAMAGE, GAPS,
KINGPIN MOVEMENT OR PLAY. IF ANY COMPONENT APPEARS DAMAGED, OR THE KINGPINS APPEAR TO CONTAIN
ANY DAMAGE, GAPS, MOVEMENT OR PLAY, THE COMPLETE AXLE ASSEMBLY MUST BE REPLACED.
IN ADDITION, IN THE EVENT A CRASH RESULTS IN EXCESSIVE SIDE LOAD DAMAGE TO ADJACENT PARTS, SUCH AS
A BENT WHEEL, HUB, OR SPINDLE, IT IS STRONGLY RECOMMENDED TO REPLACE SUCH ADJACENT PARTS AND
THE COMPLETE AXLE ASSEMBLY.
CONTACT HENDRICKSON TECHNICAL SERVICES DEPARTMENT WITH ANY QUESTIONS. FAILURE TO REPLACE ANY
DAMAGED COMPONENTS CAN CAUSE ADVERSE VEHICLE HANDLING, POSSIBLE PERSONAL INJURY, DEATH, OR
PROPERTY DAMAGE AND WILL VOID ANY APPLICABLE WARRANTIES.
SUPPORT THE VEHICLE PRIOR TO SERVICING
PLACE THE VEHICLE ON A LEVEL FLOOR AND CHOCK THE WHEELS TO HELP PREVENT THE VEHICLE FROM
MOVING. PRIOR TO SERVICING A VEHICLE IN THE RAISED POSITION, PROPERLY SUPPORT THE VEHICLE WITH
SAFETY STANDS. DO NOT WORK AROUND OR UNDER A RAISED VEHICLE SUPPORTED ONLY WITH FLOOR
JACKS OR OTHER LIFTING DEVICES, FAILURE TO DO SO CAN CAUSE DEATH, PERSONAL INJURY OR DAMAGE TO
COMPONENTS.
SUPPORT THE LIFT AXLE PRIOR TO SERVICING
PLACE THE VEHICLE ON A LEVEL FLOOR AND CHOCK THE WHEELS TO HELP PREVENT THE VEHICLE FROM
MOVING. PRIOR TO SERVICING A LIFT AXLE IN THE RAISED POSITION, (1) PROPERLY SUPPORT THE LIFT AXLE
WITH SAFETY STANDS, AND (2) RELEASE ALL AIR PRESSURE IN THE LIFT AXLE AIR SPRINGS AND RIDE SPRINGS.
DO NOT WORK AROUND OR UNDER A RAISED LIFT AXLE SUPPORTED ONLY WITH FLOOR JACKS OR OTHER
LIFTING DEVICES, FAILURE TO DO SO CAN CAUSE DEATH, PERSONAL INJURY OR DAMAGE TO COMPONENTS.
PARTS CLEANING
SOLVENT CLEANERS CAN BE FLAMMABLE, POISONOUS, AND CAUSE BURNS.TO HELP AVOID SERIOUS PERSONAL
INJURY, CAREFULLY FOLLOW THE MANUFACTURER’S PRODUCT INSTRUCTIONS AND GUIDELINES AND THE
FOLLOWING PROCEDURES:

1. WEAR PROPER EYE PROTECTION.
2. WEAR CLOTHING THAT PROTECTS YOUR SKIN.
3. WORK IN A WELL VENTILATED AREA.
4. DO NOT USE GASOLINE OR SOLVENTS THAT CONTAIN GASOLINE. GASOLINE CAN EXPLODE.
5. HOT SOLUTION TANKS OR ALKALINE SOLUTIONS MUST BE USED CORRECTLY. FOLLOW THE MANUFACTURER’S
RECOMMENDED INSTRUCTIONS AND GUIDELINES CAREFULLY TO HELP PREVENT PERSONAL ACCIDENT OR
INJURY.
DO NOT USE HOT SOLUTION TANKS OR WATER AND ALKALINE SOLUTIONS TO CLEAN GROUND OR POLISHED
PARTS. DOING SO WILL CAUSE DAMAGE TO THE PARTS AND VOID APPLICABLE WARRANTIES.

OM-H719

7

Important Safety Notice

HAC Air Kits
SECTION 4

Outside-Mounted
Composite Box

X

X

X

X

X*

HAC-MSO

X

HAC-MCA

X

HACACO / ASO

X

HACRCO / RSO

X

HACLCO / LSO

X

HACUCO / USO

HAC-ASI

See Figure 4-3 for
bracket options.

HAC-RSI

Inside-Mounted

HAC-LSI

HAC AIR KITS COMPONENTS

HAC-NSI

TABLE 4-1

HAC-SSI

HAC Air Kit Components

Outside-Mounted
Stainless Box
Outside-Mounted
Composite Box
Maryland

X

Reverse Down
& Lock Valve

X

R-009790-1
Reverse Lift
& Lock Valve

X

X

R-009790

X

Reverse Caster
Valve

X

R-010028
Electric Override
Switch
R-009791
Quick-Exhaust
Valve
R-004348-1

Pressure Protection
Valve
R-009689
In-line Filter
R-013282

X

X

X

X