INSTALLATION INSTRUCTIONS
Air Compressor for DexAir System
Mounting Location

Leaks in the system will cause the compressor to run constantly
and cause damage to the system.

ƒ Mount the compressor in a flat position inside an enclosure or
protected area to avoid direct exposure to the elements, water
spray or contact with road debris.

2.

Dielectric grease is recommended on terminals.

3.

Recommended wire type, SXL.

4.

ƒ Choose a mounting location that is away from heat sources to
avoid heat related failures.

Place 12V 30A in-line fuse on wire coming from power source,
before the toggle switch and as close to the power source as
possible.

5.

ƒ Do not mount compressor near heat sensitive materials such as
flammable liquids.

Use pipe sealant on all fittings and tighten to 10-12 ft-lbs. All
connections must be free from leaks for proper performance.

6.

Pressure switch comes with attached wires and terminals. Air
compressor has attached wires but not terminals. The installer
will need to provide additional wires and connections to complete
installation.

7.

Pressure switch is set to close at 90 P.S.I. and open at 120 P.S.I.
(close - turn on, open - turn off).

8.

Air filter is part of air compressor assembly filter element must be
changed a minimum of once per year under normal conditions.
More frequent changes are necessary when operated in a dusty
environment.

9.

Mount the pressure check valve with arrows pointing away from air
compressor leader hose.

ƒ To maximize air compressor performance, locate compressor
as close to the battery as possible, keeping positive lead wire
length to a minimum.

ƒ Select compressor mounting location that allows the remote air
filter line to reach the air inlet on the compressor. Ensure that
the remote inlet air filter is in a location such that incoming air is
as clean and dry as possible, away from the elements.
ƒ The line between the compressor and the tank must be angled
at a downward slope to ensure water condensation collects in
the tank. Line kinks or upward running lines may cause water to
pool and freeze.
ƒ Tank drain must be pointing downward, as it needs drained after
each use.
ƒ The 1.5ft leader hose bracket must be properly mounted to secure
the hose in place.

10. A 10 GA Stranded copper automotive cable minimum is required,
use table to find the recommended gauge for the length of wire.
In order to avoid voltage drop and power loss it is recommended
using: 2% VD column. (VD - voltage drop)

Getting Started - Setup and Adjustments
1.

After installation is complete, check for leaks using soapy water.

11. Wire gauge table is calculated for supplied compressor use only.
Use the chart on page 2 to calculate correct gauge wire.
Please see page 2 for installation drawing and part breakdown.

©2021 Dexter Axle Company | www.dexteraxle.com

-1-

059-A39-00 Rev. A | 2021.06

©2021 Dexter Axle Company | www.dexteraxle.com

-2-

059-A39-00 Rev. A | 2021.06

8.27

10.46

3N

3M

3L

3L

3K

3P

3F

3.31

4X .201

1.65

6.75

3C

4B

4H I

3D

3.94

2

4E

1B

3H

TAG
CONNECT TO FUSED POSITIVE POWER
BIG RED**
SOURCE
LITTLE RED** SAME
CONNECT TO LOAD OR COMPRESSOR
WHITE**
POWER WIRE
CONNECT TO GROUNDING POINT OR
BLACK**
CONTROL SWITCH

WIRE

WIRES FROM PRESSURE SWITCH

3E

3I

3J

3G

3G

(CLOSED) INLINE FUSE
10 GA. BLACK
(-) GROUND.
10WIRE
GA. TO
BLACK
WIRE
BY CUSTOMER.
TO (-) GROUND

GA.TORED
WIRE TO
(+)
10 GA. RED10
WIRE
(+) POWER
SOURCE
12V, 20ASOURCE
ATC(CLOSED)
INLINE
POWER
12V,
20AFUSE.
ATC
Y CUSTOMER.

R FURNISHED.

12V 30AMP
INLINEFUSE
FUSE.
12V 30AMP
ATCATC
INLINE

3

3A

3B

1A

4F

4J

4I

4K

3O

1A

BLACK WIRE

4A

4C

4D

4G

OUTLET HOSE FOR
AIR CONTROLS

1D

1C

PRESSURE CHECK VALVE

PRESSURE
VALVE INSPOINTING
INSTALL CHECK
WITH ARROW
ARROW POINTING AWAY FR
AWAY FROM COMPRESSOR
COMPRESSOR

WIRENUT,
NUT,
12-14
FOR
WIRE
12-14
GAUGEGAUGE
FOR BOTH
REDBOTH
WIRESRED WIRES
COMING
FROM
THE PRESSURE
SWITCH SWTICH AND THE
COMING
FROM
THE
PRESSURE
AND THE RED WIRE COMING FROM THE
RED WIRE
COMING FROM THE TOGGLE SWITCH
TOGGLE
SWITCH

GAUGE WIRE LENGTH(FT) AT 5% VD WIRE LENGTH(FT) AT 2% VD
10
0-17
0-7
8
18-27
8-11
6
27-44
12-17
4
45-69
18-27
RECOMMEND USING 2% VD COLUMN TO AVOID POWER LOSS.
NOT TO EXCEED THE 5% VD COLUMN.

BLACK WIRE

RED WIRE

WHITE WIRE

10GA.GA.
WIRE
10
REDRED
WIRE.
SUPPLIED BY CUSTOMER.

ER

KIT, HGT CONTROL VALVE (NOT SHOWN)
HCV KIT ATTACHING PARTS (NOT SHOWN)

KIT, INSTALL, PRESSURE SWITCH
PRESSURE SWITCH
TOGGLE SWITCH***
BUSHING, 1/4-FNPT X 3/8-MNPT
90° STREET TEE, 1/4-18NPT
HEX HEAD PLUG, 3/8 NPT
INT SEAL DRAIN COCK
BUSHING, 1/8-FNPT X 1/4-MNPT
CONN RING CIRC 10-12AWG***
CONN RING CIRC 10-12AWG***
CONN QC RCPT 10-12AWG 0.250***
WIRE NUT, 12-14 GAUGE

KIT, COMPRESSOR, 1/4 HP AIR
SCREW, HEX CAP 3/8-16 X 1.50
NUT, HEX CENTER LOCK 3/8-16
LEADER HOSE COUPLING
LEADER HOSE
TUBE FITTING, MALE THD
REMOTE FILTER HOSE
REMOTE AIR FILTER
HOSE BRACKET
AIR LINE CLIP
AIR LINE CLIP SCREW
COMPRESSOR MOUNTING BOLT
COMPRESSOR MOUNTING FLAT WASHER
COMPRESSOR MOUNTING LOCK WASHER
COMPRESSOR MOUNTING HEX NUT
PRESSURE CHECK VALVE
TUBE FITTING, FEMALE THD

8" AIR TANK

8" AIR TANK BRACKET KIT
MOUNTING BRACKET
HEX BOLT, 3/8-16 X 6 FULL THREAD
HEX NUT, 3/8-16
LOCK WASHER, 3/8

*Installed by customer
**Supplied by customer
***Install in dry, sealed location only

N/A 1
N/A 1

071-872-00
071-876-00

1
1
1
1
1
1
1
1
2
2
1
1

1
4
4
1
1
1
1
1
1
2
2
4
8
4
4
1
1
4
4A
4B
4C
4D
4E
4F
4G
4H*
4I*
4J*
4K

3
3A
3B
3C
3D
3E
3F
3G
3H
3I
3J
3K
3L
3M
3N
3O
3P

071-874-00

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1
4
2
2
2

071-873-00

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1
1A
1B
1C
1D

034-452-00

071-875-00

PART NUMBER ITEM QTY DESCRIPTION