stellar labs 8P User manual

Model 8P
Single-Stage Piston
Compressor Manual
Stellar Industries Inc.
740 North State Street
PO Box 169
Garner, IA 50438
800-392-3015
www.stellarindustries.com
Subject to Change without Notication.
© 2023 Stellar Industries Inc.
Rev 1
PN 92579
Specications • Installation • Assembly

Page ii | Stellar Industries®8P Compressor Manual
Model 8P Manual Revisions
Date of Revision Section Revised Description of Revision
SERIAL NO.
DATE
MODEL
MADE IN THE USA
by the Employee Owners of Stellar Industries
PN 112060
PATENT / IP INFORMATION:
www.stellarindustries.com/ip

Stellar Industries®8P Compressor Manual | Page iii
Table of Contents
For Technical Questions, Information, Parts, or Warranty, Call Toll-Free at
800-321-3741
Hours: Monday - Friday, 8:00 a.m. - 5:00 p.m. CST
Or email at the following addresses:
Technical Questions, and Information: [email protected]
Order Parts: [email protected]
Warranty Information: [email protected]
Introduction.............................................................................................................................................. iv
Chapter 1 - Specications ..............................................................................................................................1
Chapter 2 - Installation ...................................................................................................................................3
Component Installation.............................................................................................................................3
Component Installation, continued ...........................................................................................................4
8P Electrical Schematic ............................................................................................................................5
Hydraulic System......................................................................................................................................6
Air System ................................................................................................................................................6
Compressor Pressure Switch ...................................................................................................................7
Typical Hydraulic Circuit for Single-Section Pump ...................................................................................8
Typical Hydraulic Circuit for Tandem (Two Part) Pump ...........................................................................9
Typical Hydraulic Circuit for Compressor with Auxiliary Cooler ..............................................................10
Chapter 3 - Assembly Drawings ...................................................................................................................11
8P Assembly - PN B0299 .......................................................................................................................11
SUH-21 Compressor Assembly..............................................................................................................13
Crankcase Group (Tapered Shaft)..........................................................................................................14
Crankcase Group (Straight Shaft) ..........................................................................................................15
Cylinder Group .......................................................................................................................................16
Head Group ............................................................................................................................................17
Head Options..........................................................................................................................................18
Optional Head Unloader - PN 23200......................................................................................................19
Flywheel Options ....................................................................................................................................20
Clutch Options ........................................................................................................................................21
Chapter 4 - Replacement Parts....................................................................................................................23

Page iv | Stellar Industries®8P Compressor Manual
Introduction
Stellar Industries®Air Compressors are designed to provide safe and dependable service for a
variety of operations. With proper use and maintenance, these air compressors will operate at
peak performance for many years.
To promote this longevity, carefully study the information contained in this manual before putting the
equipment into service. Though it is not intended to be a training manual for beginners, this manual
should provide solid guidelines for the safe and proper usage of the air compressor.
Once you feel comfortable with the material contained in this manual, strive to exercise your
knowledge as you safely operate and maintain the air compressor. This process is vital to the
proper use of the unit.
A few notes on this manual:
A copy of this manual is provided with every air compressor and can be found in the hard plastic
manual case that is installed on the chassis. A copy of this manual shall remain with the air
compressor at all times.
Throughout the manual, three signal words will be used to bring attention to important items:
A NOTICE signal word indicates a practice not related to physical injury.
A WARNING signal word indicates a hazardous situation which, if not
avoided, could result in death or serious injury.
A DANGER signal word indicates a hazardous situation which, if not
avoided, will result in death or serious injury.
Information contained within this manual does not cover all maintenance, operating, or repair
instructions pertinent to all possible situations. Please be aware that some sections of this manual
contain information pertaining to Stellar Industries®manufactured air compressors in general and
may or may not apply to your specic model.
This manual is not binding. Stellar Industries reserves the right to change, at any time, any or all
of the items, components, and parts deemed necessary for product improvement or commercial/
production purposes. This right is kept with no requirement or obligation for immediate mandatory
updating of this manual.
In closing:
If more information is required or technical assistance is needed, or if you feel that any part of this
manual is unclear or incorrect, please contact the Stellar Industries Customer Service Department by
phone at 800-392-3015 or email at [email protected].
WARNING
NOTICE
DANGER

Stellar Industries®8P Compressor Manual | Page 1
Chapter 1 - Specications
23.06
16.69
14.13
3.44
13.006.63
1.38
SLOT
.44X0.63
TYP 4
1.38
11.38
SPECIFICATIONS 8P
Hydraulic System 7 GPM @ 1800 PSI
Max Compressor Speed 1250 RPM
Hydraulic Operating Pressure 1800 PSI
Hydraulic Relief Pressure 2500 PSI
Max Working Pressure 150 PSI
Air Delivery (At Max Speed) 8 CFM @ 100 PSI
Weight (Hydraulic Driven Assm) 125 lbs.
Weight (Air Pump Only) 52 lbs.
Dimensions (Length) 23.06"
Dimensions (Width) 14.13"
Dimensions (Height) 16.69"
Electrical 12V DC
Crankcase Oil Capacity 16 Ounces
Cooler Fan 350 CFM, 12 Volt
(Pull)
Drive Type Direct Drive
Duty cycle on Piston Compressors is 50:50 over 10 minutes.
NOTICE

Page 2 | Stellar Industries®8P Compressor Manual
This page intentionally left blank.

Stellar Industries®8P Compressor Manual | Page 3
Component Installation
Chapter 2 - Installation
This section pertains to the installation of the air compressor, PTO, pump and other related items.
The instructions are intended as a guide to assist you with particular installation. These instructions
will provide only general information.
Compressor Torque Procedure
Head Assembly:
Torque Value: 34 ft-lbs
Procedure: Assemble head on the cylinder with head bolts started
only, not tight. Working in the pattern shown, torque three times,
increasing the torque each time as follows:
First Torque: 10 ft-lbs
Second Torque: 20 ft-lbs
Third Torque: 34 ft-lbs
After ve hours of use re-torque bolts to 34 ft-lbs.
Cylinder Assembly:
Torque Value: 20 ft-lbs
Procedure: After assembling cylinder over pistons and setting into place, tighten (6) cap screws
nger tight. In a criss-cross pattern, tighten bolts evenly so all bolts are hand snug. Again in a criss-
cross pattern torque each bolt to 20 ft-lbs, checking each bolt twice. After ve hours of use, re-
torque bolts to 20 ft-lbs.
Connecting Rod Control:
Torque Value: 18 ft-lbs
Procedure: Assemble rod onto the crankshaft taking care to align the machined surfaces together
and tighten cap screws nger tight. Tighten bolts until hand tight and torque to 18 ft-lbs. Check
twice the torque reading before nal assembly of the cylinders.
12
43
56

Page 4 | Stellar Industries®8P Compressor Manual
Component Installation, continued
Pump Assembly:
The pump assembly may either be installed directly on the PTO or as an optional
method, may be driven by a driveline from the PTO. Pump manufacturers provide specic
installation information for their products and should be consulted if questions arise. Note: A dual
or tandem hydraulic pump is recommended when additional hydraulically operated equipment are
added to the hydraulic system.
PTO Assembly:
Check with the PTO manufacturer’s representative for specic instructions regarding your particular
make, model, and year of vehicle. As some trucks may require modication of the transmission
cross member and the exhaust system, the manufacturer’s instructions should be followed to
ensure proper installation of the PTO.
Compressor Assembly:
Prepare the mounting location of the compressor by locating and drilling four (4) holes, 1/2”
diameter as per the mounting pattern of the air compressor base. Using four (4) 3/8” x 1.25 GR-5
cap screws, 3/8” at washer, and 3/8” nyloc nut, secure the compressor in place. The compressor
is air cooled, and must have a clean supply of cooling air to the fan with minimum restrictions.
Adequate space must be provided for proper circulation of air.
Electric Speed Control:
An optional electric or electronic speed control must be used to maintain proper operating speed of
the air compressor. The engine speed control will automatically increase from idle to preset speed
when engaged and decrease when disengaged.
POWER SUPPLY
(12V BATTERY HOT)
GROUND
CPRSR RELAY
(12V CONTROL INPUT)
SPEED CTRL
(12V CONTROL OUTPUT)
RED 12GA
GRN 14GA
YEL 14GA
BLK 12GA
CIRCUIT BREAKER
(STELLAR SUPPLIED)
BATTERY +
ELECTRICAL PIGTAIL
(STELLAR SUPPLIED)
*MINIMUM OPERATING VOLTAGE IS 11.6VDC*
CUSTOMER ADDED WIRING FOR POWER SUPPLY
AND GROUND CIRCUIT MUST BE SIZED TO ENSURE
SUFFICIENT VOLTA GE AT THE COMPRESSOR
DURING STARTUP AND OPERATION

Stellar Industries®8P Compressor Manual | Page 5
Electrical Connections:
Supplied with the compressor is a wire harness pigtail which has 4 leads coming o󰀨 of it. Connect
the black wire to the vehicle frame or other suitable ground. Connect the red lead to a fused power
source. Mount a single throw toggle switch in a convenient location and connect the green wire
from the compressor to this switch. Connect the other switch terminal to a fuse holder and then to
a 12V power supply. The yellow wire is required from the compressor when connecting the speed
control into the system.
8P Electrical Schematic
6Class 1 Compressor Owner’s Manual
Return Line
Pressure
Line
GND
CPRSR
SPD CTRL
PRESSURE
SWITCH
LINE
MOTOR
HYDRAULIC
MANIFOLD
C
OMPRESSOR (12V INPUT)
GROUND
SPEED CONTROL
C
B
A
C
B
A
SHD-21/8P Installation
Pump Assembly:
The pump assembly may either be installed directly
on the PTO or as an optional method, may be
driven by a driveline from the PTO. Pump
manufacturers provide specific installation
information for their products and should be
consulted if questions arise.
PTO Assembly:
Check with the PTO manufactures representative
for specific instructions regarding your particular
make, model, and year of vehicle. As some trucks
may require modification of the transmission cross
member and the exhaust system, the
manufacturer’s instructions should be followed to
insure proper installation of the PTO.
Compressor Assembly:
Prepare the mounting location of the compressor
by locating and drilling four (4) holes, 7/16”
diameter as per the mounting pattern of the air
compressor base. Using four (4) 3/8” x 1.25 GR-5
cap screws, 3/8” flat washers, and 3/8” nyloc nuts,
secure the compressor in place. The compressor is
air cooled, and must have a clean supply of
cooling air to the fan with minimum restrictions.
Adequate space must be provided for proper
circulation of air.
FAN
Electric speed control:
An optional electric or electronic speed control
must be used to maintain proper operating speed
of the air compressor. The engine speed control will
automatically increase from idle to preset speed
when engaged and decrease when disengaged.
The electric cable pull speed control (American
Eagle P/N 25740) is used on most gasoline engines.
The electronic speed controls are used only on Ford
7.3 and 6.0L diesel engines. Proper installation
instructions are provided with each system.
Hydraulic System:
The hydraulic system consists of the pump, oil
reservoir, filters and hoses. Installed on the
compressor is a valve block assembly that controls
the flow to the hydraulic motor. To this block, a 1/2”
high-pressure hose must be attached. This hose
comes from the hydraulic pumps pressure side. A
3/4” minimum low-pressure return line is connected
to the oil cooler outlet and is routed to the oil
reservoir. American Eagle recommends a sufficient
sized reservoir be provided which includes the
proper suction and return filters. The cooler on the
compressor is designed and sized to cool the air
compressor efficiently. An auxiliary oil cooler is
required when additional hydraulically operated
equipment are added to the hydraulic system.
Pressure on the return line exceeding 200 PSI can
and will cause damage to the filter, cooler, and
components of the compressor hydraulic system.

Page 6 | Stellar Industries®8P Compressor Manual
HYDRAULIC PRESSURE
-8 SAE PORT
HYDRAULIC RETURN
-12 MALE JIC
AIR DISCHARGE
-12 FEMALE NPT
The hydraulic system consists of the oil reservoir, pump, manifold, motor, lters, and hoses. A
½” 3000psi pressure line should be connected to the pressure line tting on the bulkhead. This
line is plumbed though an internal manifold block, and then to the motor. After the motor there is
an internal cooler which the oil passes through before going to the return line bulkhead tting. A
¾” minimum low-pressure return line is to connect to the return bulkhead tting and lter before
being returned to the oil reservoir. Stellar Industries recommends a su󰀩ciently-sized reservoir
be provided that includes the proper suction and return lters. The cooler on the compressor is
designed and sized to cool the air compressor e󰀩ciently. An auxiliary oil cooler is required when
additional hydraulically operated equipment is added to the hydraulic system. Pressure on the
return line exceeding 200PSI can and will cause damage to the lter, cooler, and components of the
compressor’s hydraulic system.
The airline is routed using a ¾” 200 psi air/steam hose. This delivery line should be free from all
obstructions. Note: There should be no check valve installed between the compressor and the
air tank (One is already included in the compressor package). Stellar Industries recommends the
installation of a ten-gallon air tank (minimum) to maintain proper operation of the air compressor.
Hydraulic System
Air System

Stellar Industries®8P Compressor Manual | Page 7
Pressure Setting Instructions:
1. Always set the kick out pressure setting rst. Adjust the kick out screw setting to 145 psi
minimum/150 psi maximum.
2. After kick out pressure is set, adjust the kick on screw setting to 115 psi minimum/120 psi
maximum.
3. Cycle compressor to verify correct settings.
4. For questions about this procedure, please contact Stellar Industries Customer Service at
800-321-3741.
Compressor Pressure Switch
Kick Out (Step 1)
Pressure Setting
Adjustment Screw
(145-150 psi)
Kick On (Step 2)
Pressure Setting
Adjustment Screw
(115-120 psi)
Note: Turning adjustment screws clockwise increases psi settings.
Turning adjustment screws counterclockwise decreased psi settings.
Pressure
Switch

Page 8 | Stellar Industries®8P Compressor Manual
Typical Hydraulic Circuit for Single-Section Pump
PN 30533

Stellar Industries®8P Compressor Manual | Page 9
Typical Hydraulic Circuit for Tandem (Two Part) Pump
PN 30532

Page 10 | Stellar Industries®8P Compressor Manual
Typical Hydraulic Circuit for Compressor with Auxiliary Cooler
COMPRESSOR
RETURN
PRESSURE
AUXILIARY
COOLER
SINGLE
HYDRAULIC
PUMP
SUCTION PORT
FILTER
FILTER SCREEN
HYDRAULIC
RESERVOIR

Stellar Industries®8P Compressor Manual | Page 11
8P Assembly - PN B0299
47
27
55
13
54
8
11
2
50
31
18
49
32
4
3
25
26
14
24
32
53
12
7
53
3
15
35
39
41
40
46
38
9
11
48
36
39
28
43
21
17
52
23
16
29
12
10
33
37
56
42
44
45
34
6
53
30
53
12
32
51
5
22
8
32
53
3
8
1
20
1
19
TORQUE: 25 FT.-LBS.
TORQUE: 25 FT.-LBS.
Chapter 3 - Assembly Drawings

Page 12 | Stellar Industries®8P Compressor Manual
8P Assembly Bill - PN B0299
ITEM
PART
DESCRIPTION
QTY.
1 0333
NUT 0.25-20 HHGR5 NYLOC
4
2 0340
WASHER 0.25 FLAT
2
3 0342
NUT 0.31-18 HH NYLOC
10
4 0343
WASHER 0.31 USS FLAT ZINC
4
5 0345
CAP SCR 0.38-16X1.50 HHGR5
2
6 0347
NUT 0.38-16 HH NYLOC
2
7 0420
CAP SCR 0.31-18X0.75 HHGR5
2
8 0479
CAP SCR 0.25-20X0.75 HHGR5
6
9 0483
CAP SCR 0.25-20 X 3.50 HHGR5
2
10 0488
CAP SCR 0.31-18X2.00 HHGR5
4
11 0521
WASHER 0.25 LOCK
4
12 0522
WASHER 0.31 LOCK
10
13 11284
PULSATION TANK SHD30
1
14 12808
FTG 12-8 MJ-MORB STRAIGHT
2
15 12809
BRKT COOLER MNT SHD 30/21
1
16 13579
FTG 8-8X2.50 MP-MP NIPPLE STRAIGHT BRASS
1
17 16605
HOSE STEAM 0.75(200PSI)-12MP RIGID- 12MP-14.38CL
1
18 16641
TUBE COPPER 0.25X9.00
1
19 29589
PANEL SHROUD FAN SHD21
1
20 29590
CAP SHROUD FAN SHD21
1
ITEM
PART
DESCRIPTION
QTY.
21 4156
BASE WLDMT SHD30 L BASE
1
22 4568
MOTOR HYD 21306 DSE
1
23 4582
FTG 0.75-0.50 BUSH RED 44-509
1
24 4586
FAN 7.50" PULL 12 VOLT SPL 301003
1
25 5139 HOOD F/G SHD30
1
26 5472
COOLER OIL SHD30 & SHD21
1
27 5480
VALVE CHECK 0.75 STANDARD
1
28 5590
TUBE ASM MANIF TO CLR 0.75 SHD30/21 ZC
1
29 5662
SPACER SHD21 CPRSR PC BLACK
2
30
B0800
BRACKET MOTOR MOUNT
1
31
C0863
SWITCH PRES COMPRESSOR
1
32
C0922
CAP SCR 0.31-18X1.00 HHGR5
14
33
C1080
CPRSR 143CI4NP
1
34
C2261
DRAIN COCK
1
35
C2297
TUBE ASM 0.50 MANIF TO MOTOR SHD60 YZ
1
36
C2322
FTG 8 MORB PLUG
1
37
C3480
COUPG HYD CPRSR TAPER
1
38
C3558
MANIFOLD BLOCK SHD60
1
39
C4498
FTG 12-12 MJ-MORB STRAIGHT
2
40
C4499
VALVE SOLND
1
ITEM
PART
DESCRIPTION
QTY.
41
C4501
FTG 8-8 MJ-MAORB 90
1
42
C4570
CAP SCR 0.31-24X0.75 HH NF
1
43
C4671
FTG 8-12 MJ-MAORB 90
1
44
C4779
COUPG SPIDER SUL 99 BLUE URETHANE
1
45
C4781
COUPLING LOVEJOY 5/8
1
46
C4914
VALVE RELIEF CP-200-1-B-0-A-C
1
47
C4954
TUBE ASM 0.50 MANIF TO MOTOR SHD60 YZ
1
48
C4961
FTG 6 MORB PLUG HOLLOW HEX
1
49
C5616
CLAMP ROMEX 0.50
1
50
C6101
FTG 4-2 MP-MP HEX NIPPLE
1
51
C6145 FTG 12-12 MJ-MAORB 90
1
52
C6175
FTG 12-12 FP-FP 90
1
53
C6353
WASHER 0.38 FLAT GR8
14
54
D0240
FTG 4-2 CPRSN-MP 90
1
55
D1264
FTG 0.75-CLOSE RED BRASS NIPPLE
1
56
D1465
WASHER 0.31-0.178 THICK
1

Stellar Industries®8P Compressor Manual | Page 13
.YTQNOITPIRCSEDTRAPMETI.YTQNOITPIRCSEDTRAPMETI
1C1082 CPRSR 143CWI4NP176482ST EL 0.50 45 DEG BRAS
S1
2C4703 KEY WOODRUFF 5/32 X 3/4 #8 1820464REDU BUSHING 0.75X0.50 BRASS1
35417FTG .50X90 DEG ST EL BRASS 441631 98158NIPPLE 0.25 X CLOSE BRAS
S1
44583NIPPLE 0.50XCLOSE BRASS 40-060 310C0863 SWITCH PRES COMPRESSOR 1
5C5514 VALVE CHECK .50111 SEE PAGE 15 - CLUTCH OPTIONS
620465 TEE 0.50X0.50X0.25 BRASS1
COMPRESSOR ASSEMBLY
SUH-21 Compressor Assembly

Page 14 | Stellar Industries®8P Compressor Manual
Crankcase Group (Tapered Shaft)
CRANKCASE GROUP
.YTQNOITPIRCSEDTRAPMETI.YTQNOITPIRCSEDTRAPMETI
1C5425 CRANKCASE 143110 6178 BEARING CARRIER 143 T-SHAFT 1
26177BAFFLE PLATE 143111 C6268BEARING SEAL V480 1
30478CAP SCR 0.25-20X0.50 HHGR5 4120485CAP SCR 0.31-18X1.25 HHGR54
4C6266BEARING HOLE PLUG 113C0497 CRANKSHAFT 143 TAPER1
5C1163 BEARING CUP (LM67010) 214C0856 BEARING CONE LM67048 2
66076BEARING PLT GASKET .015" 1434 15 0522 WASHER 0.31 LOCK 4
7C6265BREATHER VALVE BUMPER 2165790PLUG OIL DRAIN-20
01
1341KCITSPID8261C71203DHS/002EVLAVREHTAERB4626C8
1211-GNIR'O1400C812KCOL52.0REHSAW12509

Stellar Industries®8P Compressor Manual | Page 15
21
01
11
01
2
3
9
1
3
4
8
5
31
6
61
51
41 7
71
6
81
.YTQNOITPIRCSEDTRAPMETI
1341ESACKNARC5245C1
1TFAHS-S341REIRRACGNIRAEB036222
2)01076ML(PUCGNIRAEB3611C3
1GULPELOHGNIRAEB6626C4
1341ETALPELFFAB77165
45RGHH05.0X02-52.0RCSPAC87406
45RGHH00.1X81-13.0RCSPAC2290C7
1DHQSTPN52.0GULP09758
4341"510.TEKSAGTLPGNIRAEB67069
284076MLENOCGNIRAEB6580C01
1S341TFAHSKNARC2382211
1341KCITSP
ID8261C21
1211-GNIR'O1400C31
203DHS/002EVLAVREHTAERB4626C41
2REPMUBEVLAVREHTAERB5626C51
2KCOL52.0REHSAW125061
4KCOL13.0REHSAW225071
161/3LEEHWYLFYEK8403281
CRANKCASE GROUP
Crankcase Group (Straight Shaft)

Page 16 | Stellar Industries®8P Compressor Manual
6
11
01
2
7
8
21 3
5
1
4
5
9
21
.YTQNOITPIRCSEDTRAPMETI
2341DORGNITCENNOC9926C1
2TEKSAGREDNILYC7400C2
2DO36.2NOTSIP8102C3
2NIPNOTSIP9651C4
426-0005NNIPNOTSIPGNIRPANS3726C5
1063VREDNILYC5400C6
2NSRPCGNIR5600C7
4EVOORGQS063VNSRPCGNIR73068
2REDIVIDXELF063VLIOGNIR63069
6KCOL13.0REHSAW225001
65RGHH00.1X81-13.0RCSPAC2290C11
4LIARGNIR063VLIOGNIR7636321
CYLINDER GROUP
Cylinder Group