McGraw MG2HPSS Assembly instructions

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'()*+,-,./)0,+1(20)1.32+4)5.6)
6,5/7)8+(9)19*+(*,+)1.0/5::5/1(.;
ONLY a qualified engineer with
appropriate certifications may attempt
designing a new compressor to ensure
that all required safety and control
elements are in place and will work
together properly and safely. This
compressor pump is intended ONLY
as a replacement for a similarly rated
pump on an existing compressor that
includes all other needed components.
Constructing a new compressor using
this pump is not covered by the manual.
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@101/)(2+)A,B01/,)5/;)7//*;CCAAAD75+B(+8+,1E7/DF(9
G951:)(2+)/,F7.1F5:)02**(+/)5/;)*+(62F/02**(+/H75+B(+8+,1E7/DF(9
Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the
back of the manual near the assembly diagram (or month and year of purchase if product has no number).
Keep this manual and the receipt in a safe and dry place for future reference. 21b
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright© 2020 by Harbor Freight Tools®. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in
any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
Tools required for assembly an d se rv ic e may n ot b e in cl uded.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

Page 2 I(+)/,F7.1F5:)J2,0/1(.0K)*:,50,)F5::)LM===M=NNM<O?OD Item 58494
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Safety ......................................................... 2
Specifications ............................................. 5
Installation .................................................. 6
Maintenance and Servicing ....................... 11
Parts List and Diagram .............................. 15
Warranty .................................................... 16
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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.
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Addresses practices not related to personal injury.
%RTV#'"$')P"IG'Q)%$IV#R"'%V$
&,.,+5:)P58,/4)!5+.1.E0
) !"#$%$&)#,56)5::)058,/4)A5+.1.E0)5.6)1.0/+2F/1(.0D)))
Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.
P5-,)5::)A5+.1.E0)5.6)1.0/+2F/1(.0)8(+)82/2+,)+,8,+,.F,D
The warnings, precautions, and instructions discussed in this instruction manual cannot cover all possible
conditions and situations that may occur. It must be understood by the operator that common sense
and caution are factors which cannot be built into this product, but must be supplied by the operator.
1. !(+Y)5+,5)058,/4
a. Z,,*)A(+Y)5+,5)F:,5.)5.6)A,::):1/D
Cluttered or dark areas invite accidents.
b. X().(/)(*,+5/,)/7,)S(9*+,00(+)T29*)1.)
,[*:(01-,)5/9(0*7,+,0K)02F7)50)1.)/7,)
*+,0,.F,)(8)8:5995B:,):1J2160K)E50,0)(+)620/D
Compressor pump motors produce sparks
which may ignite the dust or fumes.
c. Z,,*)F71:6+,.)5.6)B40/5.6,+0)5A54)
8+(9)5.)(*,+5/1.E)F(9*+,00(+)*29*D
2. T,+0(.5:)058,/4
a. P/54)5:,+/K)A5/F7)A75/)4(2)5+,)6(1.E)
5.6)20,)F(99(.)0,.0,)A7,.)(*,+5/1.E)
/710)F(9*+,00(+)*29*D))X().(/)20,)/710)
F(9*+,00(+)*29*)A71:,)4(2)5+,)/1+,6)
(+)2.6,+)/7,)1.8:2,.F,)(8)6+2E0K)5:F(7(:)
(+)9,61F5/1(.D A moment of inattention
while operating a compressor pump may
result in serious personal injury.
b. \0,)*,+0(.5:)*+(/,F/1-,),J21*9,./D))
":A540)A,5+)"$P%M5**+(-,6),4,)
*+(/,F/1(.)62+1.E)0,/2*)5.6)20,D

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3. Compressor Pump use and care
a. X10F(..,F/)/7,)*:2E)(8)/7,)F(9*+,00(+)
9(/(+)8+(9)/7,)*(A,+)0(2+F,)B,8(+,)
1.0/5::1.EK)95Y1.E)5.4)56320/9,./0K)F75.E1.E)
5FF,00(+1,0K)(+)0/(+1.E)/7,)S(9*+,00(+)
T29*D Such preventive safety measures
reduce the risk of starting the unit accidentally.
b. P/(+,)5.)16:,)F(9*+,00(+)*29*)(2/)(8)/7,)
+,5F7)(8)F71:6+,.)5.6)6().(/)5::(A)*,+0(.0)
2.8591:15+)A1/7)/7,)F(9*+,00(+)*29*)(+)/7,0,)
1.0/+2F/1(.0)/()(*,+5/,)1/D A compressor pump
is dangerous in the hands of untrained users.
c. R51./51.)/7,)S(9*+,00(+)T29*D))Z,,*)
/7,)S(9*+,00(+)T29*)F:,5.)8(+)
B,//,+)5.6)058,+)*,+8(+95.F,D))I(::(A)
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5FF,00(+1,0D))Z,,*)6+4K)F:,5.)5.6)8+,,)8+(9)
(1:)5.6)E+,50,D))S7,FY)8(+)9105:1E.9,./)
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(8)*5+/0)5.6)5.4)(/7,+)F(.61/1(.)/75/)
954)588,F/)/7,)F(9*+,00(+]0)(*,+5/1(.D))
%8)6595E,6K)75-,)/7,)F(9*+,00(+)+,*51+,6)
B,8(+,)20,D Many accidents are caused by
a poorly maintained compressor pump.
d. \0,)/7,)S(9*+,00(+)T29*)1.)5FF(+65.F,)
A1/7)/7,0,)1.0/+2F/1(.0K)/5Y1.E)1./()5FF(2./)
/7,)A(+Y1.E)F(.61/1(.0)5.6)/7,)A(+Y)/()B,)
*,+8(+9,6D Use of the Compressor Pump
for operations different from those intended
could result in a hazardous situation.
4. P,+-1F,
a. ^5-,)/7,)S(9*+,00(+)T29*)0,+-1F,6)B4)5)
J25:181,6)+,*51+)*,+0(.)201.E)(.:4)16,./1F5:)
+,*:5F,9,./)*5+/0D This will ensure that the
safety of the Compressor Pump is maintained.
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*29*)10)1./,.6,6)V$UQ)50)5)+,*:5F,9,./)
8(+)5)0191:5+:4)+5/,6)*29*)(.)5.),[10/1.E)
F(9*+,00(+)/75/)1.F:26,0)5::)(/7,+).,,6,6)
F(9*(.,./0D))S(.0/+2F/1.E)5).,A)F(9*+,00(+)
201.E)/710)*29*)10).(/)F(-,+,6)B4)/710)95.25:D
2. \0,)P58,/4)&25+6)8(+)T2::,40D The Air
Compressor Pump Pulley, belts (not included),
and motor pulley (not included) must be covered
by a safety guard (not included) covering
all moving elements before operation.
3. W,8(+,)81+0/)5.6),-,+4)20,K)-,+184)
T29*)750)02881F1,./)(1:D
4. The use of accessories or attachments not
recommended by the manufacturer may
result in a risk of injury to persons.
5. R105:1E.9,./)B,/A,,.)R(/(+)5.6)T29*)
F5.)6595E,)/7,)T29*)T2::,4D))Use a
straight edge, such as a yardstick, to check
and adjust alignment as needed.
6. \0,)*+(*,+)01_,)9(/(+)5.6)9(/(+)*2::,4D))
This Air Compressor Pump must be installed
with a 2 HP electric motor and pulley (both not
included) which can turn the Air Compressor
Pump Pulley at approximately 1300 RPM.
7. %.0/5::)9(/(+K)*2::,4)B,:/0)5.6)*2::,4)B,:/)
F(-,+)0,F2+,:4D Be sure to use the proper size
bolts to install the motor (not included). The belts
and belt cover (not included) must be strong
enough to prevent breaking and possible injury.
8. W,)02+,)5::),J21*9,./)10)+5/,6)/()/7,)
5**+(*+15/,)F5*5F1/4)(8)/710)*29*D))Make sure
that the lowest rated piece of equipment being
used can handle the maximum pressure of the
Air Compressor Pump (see Specifications).
9. X().(/)61+,F/)/7,)51+)0/+,59)5/)
5.4)*,+0(.)(+)5.195:D)
10. "-(16)B2+.0D))The Cylinders (14), Cylinder
Heads (5) and Air Outlet components become
very hot during operation. Do not touch.
11. Industrial applications must follow OSHA guidelines.
12. Maintain labels and nameplates on the
Compressor Pump. These carry important safety
information. If unreadable or missing, contact
Harbor Freight Tools for a replacement.
13. This product is not a toy.
Keep it out of reach of children.

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2. #10Y)(8)B2+0/1.E)M)6().(/)56320/)+,E2:5/(+)71E7,+)
/75.)95+Y,6)95[1929)*+,002+,)(8)5//5F79,./D
3. #10Y)(8)1.32+4)M)6().(/)61+,F/)51+)
0/+,59)5/)*,(*:,)(+)5.195:0D
4. X().(/)20,)/()02**:4)B+,5/71.E)51+D
5. X().(/):,5-,)F(9*+,00(+)2.5//,.6,6)
8(+)5.),[/,.6,6)*,+1(6)A71:,)*:2EE,6)1.D))
\.*:2E)F(9*+,00(+)58/,+)A(+Y1.ED
6. Z,,*)F(9*+,00(+)A,::M-,./1:5/,6D))
X().(/)F(-,+)F(9*+,00(+)62+1.E)20,D
7. Drain tank daily and after use. Internal rust causes
tank failure and explosion.
8. Add correct amount of compressor oil before first
use and every use. Operating with low or no oil
causes permanent damage and voids warranty.
9. Do not remove the valve cover or
adjust internal components.
10. Compressor head gets hot during operation.
Do not touch it or allow children nearby
during or immediately following operation.
11. Do not use the air hose to move the compressor.
12. Release the pressure in the
storage tank before moving.
13. The use of accessories or attachments not
recommended by the manufacturer may
result in a risk of injury to persons.
14. All air line components, including hoses, pipe,
connectors, filters, etc., must be rated for at least
a working pressure of 150 PSI, or 150% of the
maximum system pressure, whichever is greater.
15. USE OF AN EXTENSION CORD IS NOT
RECOMMENDED. If you choose to use an
extension cord, use the following guidelines:
'"WUG)";))#GSVRRG$XGX)R%$%R\R)!%#G)
&"\&G)IV#)Gb'G$P%V$)SV#XP)
cL`a)@VU'd
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25′ 50′ 100′ 150′
0 – 6 18 16 16 14
6.1 – 10 18 16 X().(/)20,D
10.1 – 12 16 16 X().(/)20,D
12.1 – 16 14 12 X().(/)20,D
a. Make sure your extension cord
is in good condition.
b. Be sure to use an extension cord which
is heavy enough to carry the current your
product will draw. An undersized cord will
cause a drop in line voltage resulting in loss
of power and overheating. Table A shows the
correct size to use depending on cord length
and nameplate ampere rating. If in doubt,
use the next heavier gauge. The smaller
the gauge number, the heavier the cord.
16. Operate unit on level surface. Check oil level
daily and fill to marked level if needed.
17. People with pacemakers should consult their
physician(s) before use. Electromagnetic fields in
close proximity to heart pacemaker could cause
pacemaker interference or pacemaker failure.
)P"@G)'^GPG)%$P'#\S'%V$PD

Page 5I(+)/,F7.1F5:)J2,0/1(.0K)*:,50,)F5::)LM===M=NNM<O?ODItem 58494
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S(9*+,00(+)T29*D))$,-,+)+,9(-,)/7,)E+(2.61.E)*+(.E)8+(9)/7,)*:2ED))X().(/)20,)/7,)9(/(+)18)/7,)*(A,+)
F(+6)(+)*:2E)10)6595E,6D))%8)6595E,6K)75-,)1/)+,*51+,6)B4)5)0,+-1F,)85F1:1/4)B,8(+,)20,D))%8)/7,)*:2E)A1::).(/)81/)
/7,)(2/:,/K)75-,)5)*+(*,+)(2/:,/)1.0/5::,6)B4)5)J25:181,6),:,F/+1F15.D
P49B(:(E4
TP% Pounds per square inch of pressure
SIR Cubic Feet per Minute flow
PSIR Cubic Feet per Minute flow
at standard conditions
$T' National pipe thread, tapered
$TP National pipe thread, straight
Double Insulated
@Volts
eAlternating Current
"Amperes
P*,F181F5/1(.0
Type Single Stage V-Style; Oil Lubricated
Required HP 2 HP motor
Max PSI 155 PSI
Max RPM 1300 RPM
Air Outlet 9/16″ - 24 UNEF Thread
Air Delivery
@ 1050 RPM
6.2 SCFM @ 40 PSI
5.3 SCFM @ 90 PSI
Lubrication Splash Type with Oil Level Window
Oil Type Synthetic non-detergent Air Compressor Oil
(Sold separately)
Pump Pulley 10.5″ diameter with A type-groove
Bolt Pattern 6-3/4″ L X 3-9/16″ W
Recommended
Mounting Bolts 5/16" diameter, grade 5 or better
Overall Dimensions 13-1/2″ L X 10-3/4″ W x 12-1/4″ H
Sound Level 86 dB @ 1m

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) #,56)/7,)G$'%#G %RTV#'"$')P"IG'Q)%$IV#R"'%V$)0,F/1(.)5/)/7,)B,E1..1.E)(8)/710)
95.25:)1.F:261.E)5::)/,[/)2.6,+)02B7,561.E0)/7,+,1.)B,8(+,)0,/)2*)(+)20,)(8)/710)*+(62F/D
'V)T#G@G$')PG#%V\P)%$f\#Q)I#VR)"SS%XG$'"U)VTG#"'%V$;
'2+.)/7,)T(A,+)PA1/F7)gVIIh)5.6)2.*:2E)/7,)"1+)S(9*+,00(+)8+(9)1/0),:,F/+1F5:)
(2/:,/)B,8(+,)500,9B:1.E)(+)95Y1.E)5.4)56320/9,./0)/()/7,)F(9*+,00(+D
$(/,; For additional information regarding the parts listed in the following pages,
refer to the Assembly Diagram near the end of this manual.
S(9*(.,./0
Air Filter Assembly
Cylinder Head
Cylinder
Pump Flywheel
Oil Sight Glass
Crankcase
Oil Drain Plug
Oil Fill Plug
"00,9B:4
1. Make sure center hole on Pump Flywheel
(31) is free of burrs and rough edges.
2. Align center hole of Pump Flywheel with Crankshaft.
Slide Pump Flywheel onto Crankshaft. Pump
Flywheel should be installed for counterclockwise
rotation when facing the pulley side of the Pump.
!5+.1.Ei Do not force or hammer the
Pump Pulley onto the Crankshaft.
3. Slide the Washer (32) onto Bolt (33) and
insert Bolt through Pump Flywheel and
thread counterclockwise into the Crankshaft.
Tighten using wrench (not included).
%.0/5::5/1(.
1. Place Air Compressor Pump on mounting
surface at same level as 2HP (1.6 running HP)
motor used to drive it. Pump positioning must
incorporate easy access to Oil Drain Plug (22).
2. Use a motor (not included) with appropriate sized
pulley to achieve the target RPM (1300 max RPM).

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$(/,; Recommended pulley size is 3.75″.
To calculate needed pulley diameter, multiply
Pump Pulley Diameter (10.5″) by Pump RPM
(1300). Divide this number by motor RPM to get
the necessary motor pulley size. See Figure A.
I1E2+,)";))S5:F2:5/1(.)8(+)R(/(+)T2::,4
3. Pump Flywheel (31) must be in perfect alignment
with motor pulley. Misalignment between motor
and Pump can cause damage to equipment.
4. Verify that Pump Flywheel turns freely where
it overhangs the mounting surface.
5. Place a Type A Belt (not included) over Pump
Flywheel and motor pulley (not included).
6. Pull Compressor Pump until properly aligned,
and the belt is tight. Recheck alignment of
motor pulley, belt, and Pump Flywheel.
7. To mount Compressor Pump:
a. Use mounting holes in Compressor Pump
Base as a template to mark spots where four
holes will be drilled into mounting surface.
b. Move Compressor Pump aside, and drill four
5/16″ diameter holes in the mounting surface.
c. Move Compressor Pump back to mounting
position and secure each corner of the base
with a 5/16″ diameter Grade 5 (or better) bolt,
washer, lock washer, and nut (all not included).
d. Recheck Pump, belt, and pulley alignment.
Make adjustments as necessary.
$(/,; To test proper tension on belt, press down on belt.
There should be 1/2″ deflection or less at mid span.
8. Connect plumbing hardware (not included) from Air
Outlet to Air Destination (i.e., air pressure tank of
compressor, not included).Route tubing in shortest
possible path.
9. Depending on the air tool, you may need to incorporate
additional components, such as in-line oiler, filter, or
dryer (all sold separately), as shown in Figure C and
D on page 8 and 9. Consult your air tool’s manual for
needed accessories.
10. Install safety guard (not included) that surrounds motor
pulley, belt, and Pump Flywheel. Safety guard should
cover all sides of moving belt and pulleys. Safety guard
must have one inch clearance from all moving parts
and should be sturdy enough to prevent injury.
!5+.1.Ei Do not operate Air Compressor
Pump without safety guard in place.
11. Fill Compressor Pump Crankcase with appropriate
amount of Air Compressor Oil (sold separately).
S7,FY1.E)V1:)U,-,:
1. Check oil level before operating Air Compressor Pump.
%RTV#'"$'; Running Pump with no oil or low oil will
cause damage to equipment and void warranty.
2. Fill Pump Crankcase with synthetic non-
detergent Air Compressor Oil.
3. Oil level should be at the center of the FULL level
on the Oil Sight Glass (21). Add oil as needed to
maintain this level. Do not let oil level go below
center circle (LOW) and do not fill oil above center
circle (OVERFILL). See Figure B.
V@G#I%UU
UV!
I\UU
I1E2+,)W;)))V1:)P1E7/)&:500
4. To add oil:
a. Remove the Oil Fill Plug.
b. Using a funnel to avoid spills, pour enough
oil into the Pump Crankcase to reach
the “full” level in the Oil Sight Glass.
c. Replace the Oil Fill Plug.
5. If uncertain which oil to use for this compressor,
call Harbor Freight Tools customer service
at 1-888-866-5797 for assistance.
6. S75.E,)/7,)F(9*+,00(+)(1:)58/,+)/7,)81+0/)
7(2+)(8)20,)/()+,9(-,)5.4)6,B+10D
S"\'%V$i)'V)T#G@G$')%$f\#Q)I#VR)W\#$P;)
X().(/)566)(+)F75.E,)/7,)(1:)A71:,)
/7,)F(9*+,00(+)10)1.)(*,+5/1(.D))
"::(A)/7,)F(9*+,00(+)/()F((:)B,8(+,)+,*:5F1.E)(1:D

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I1E2+,)S;))T(+/5B:,)"1+)P2**:4)P,/2*
G
A
E
E
H
F
B
Non-lubricated Tools Lubricated Tools
A
B
C
C
DA
X,0F+1*/1(. I2.F/1(.
A Air Hose Connects air to tool
B Filter Prevents dirt and condensation from damaging tool or workpiece
C Regulator Adjusts air pressure to tool D Lubricator (optional) For air tool lubrication
E Coupler and Plug Provides quick connection and release
F Leader Hose (optional) Increases coupler life
G Air Cleaner / Dryer (optional) Prevents water vapor from damaging workpiece
H Air Adjusting Valve (optional) For fine tuning airflow at tool

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I1E2+,)X;))P/5/1(.5+4)"1+)P2**:4)P,/2*
N
L
L O
M
C C
Non-lubricated Tools
Lubricated Tools
H
I
I
J
JKH
F
G
E
Slope
F
F
B
B
A
A
CD
X,0F+1*/1(. I2.F/1(.
A Vibration Pads For noise and vibration reduction
B Anchor Bolts Secures air compressor in place
C Ball Valve Isolates sections of system for maintenance D Isolation Hose For vibration reduction
EMain Air Line - 3/4″ minimum recommended Distributes air to branch lines
F Ball Valve To drain moisture from system
GBranch Air Line -1/2″ minimum recommended Brings air to point of use
H Air Hose Connects air to tool
I Filter Prevents dirt and condensation from damaging tool or workpiece
J Regulator Adjusts air pressure to tool
K Lubricator (optional) For air tool lubrication
L Coupler and Plug Provides quick connection and release
M Leader Hose (optional) Increases coupler life
N Air Cleaner / Dryer (optional) Prevents water vapor from damaging workpiece
O Air Adjusting Valve (optional) For fine tuning airflow at tool

Page 10 I(+)/,F7.1F5:)J2,0/1(.0K)*:,50,)F5::)LM===M=NNM<O?OD Item 58494
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Page 11I(+)/,F7.1F5:)J2,0/1(.0K)*:,50,)F5::)LM===M=NNM<O?ODItem 58494
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R51./,.5.F,)5.6)P,+-1F1.E
) T+(F,62+,0).(/)0*,F181F5::4),[*:51.,6)1.)/710)95.25:)920/)
B,)*,+8(+9,6)(.:4)B4)5)J25:181,6)/,F7.1F15.D
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B,8(+,)*,+8(+91.E)5.4)1.0*,F/1(.K)951./,.5.F,K)(+)F:,5.1.E)*+(F,62+,0D
'V)T#G@G$')PG#%V\P)%$f\#Q)I#VR)SVRT#GPPV#)I"%U\#G;)
X().(/)20,)6595E,6),J21*9,./D))%8)5B.(+95:).(10,)(+)-1B+5/1(.)(FF2+0K)
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S:,5.1.EK)R51./,.5.F,K)5.6)U2B+1F5/1(.
1. WGIV#G)G"S^)\PGK inspect the general
condition of the air compressor. Check for:
• loose hardware,
• misalignment or binding of moving parts,
• cracked or broken parts,
• damaged electrical wiring, and
• any other condition that may
affect its safe operation.
2. "I'G#)\PGK wipe external surfaces of
the compressor with a clean cloth.
3. !"#$%$&i))%8)/7,)02**:4)F(+6)(8)/710)
F(9*+,00(+)10)6595E,6K)1/)920/)B,)+,*:5F,6)
(.:4)B4)5)J25:181,6)0,+-1F,)/,F7.1F15.D
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Following are general guidelines for maintenance checks of the Air Compressor.
$(/,; The environment in which the compressor is used, and the frequency of use will affect how often
you will need to check the Air Compressor components and perform maintenance procedures.
X51:4;
a. Check oil level.
b. Check for oil leaks.
c. Make sure all nuts and bolts are tight.
d. Check for abnormal noise or vibration.
e. Check for air leaks.*
f. Inspect belts.
g. Wipe off any oil or dirt from
the compressor pump.**
* To check for air leaks, apply soapy water to joints while
the Air Compressor is pressurized. Look for air bubbles.
** To clean the compressor surface, wipe with
a damp cloth, using a mild detergent or mild solvent.
!,,Y:4;
a. Inspect Air Filter.
b. Inspect Oil Breather (34).
R(./7:4;
a. Check Belt Adjustments.
G-,+4)N)9(./70)(+)Laa)V*,+5/1(.)^(2+0;
Replace Pump oil.***
*** Use synthetic,SAE 30W, non-detergent,
Air Compressor Oil only (sold separately).

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V1:)R51./,.5.F,
Check the oil periodically for clarity. Replace oil if it appears milky or if debris is present,
or every 6 months, or 100 operation hours, whichever comes first.
Replace the oil more frequently if compressor is used in harsh environments such as high heat or high humidity.
S"\'%V$i))'V)T#G@G$')%$f\#Q)I#VR)W\#$P;)
"::(A)"1+)S(9*+,00(+)/()F((:)B,8(+,)F75.E1.E)/7,)(1:D
1. Place a container under the Oil Drain Plug.
2. Remove the Oil Fill Plug to allow
air flow into the Pump.
3. Remove the Oil Drain Plug, allowing
the oil to drain into the container.
4. When the oil is completely drained from the Pump,
replace the Oil Drain Plug.
5. Fill the Pump with new synthetic, non-
detergent air compressor oil to the FULL
level on the Oil Sight Glass (21).
6. Replace and tighten the Oil Fill Plug.
7. Discard the old oil according to local,
state and federal regulations.
"1+)I1:/,+)R51./,.5.F,
Check the Air Filter weekly to see if it needs replacement.
Replace the filter more often if compressor is used in dirty environments.
1. Remove Filter Front Cover.
2. Remove the Air Filter.
3. Replace with a new Air Filter.
4. Replace the Cover.

Page 13I(+)/,F7.1F5:)J2,0/1(.0K)*:,50,)F5::)LM===M=NNM<O?ODItem 58494
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T+(B:,9 T(001B:,)S520,0 U1Y,:4)P(:2/1(.0
Compressor builds
pressure too slowly
1. Crankcase oil overfilled or oil too thick.
2. Working environment too cold.
3. Loose fittings.
1. Drain oil and refill to proper level with recommended oil.
Check that recommended oil is in crankcase.
2. Move compressor to a warmer location.
3. Reduce air pressure, then check all fittings with
a soap solution for air leaks and tighten as needed.
Do not overtighten.
Compressor not
building enough
air pressure
1. Air filters need cleaning/replacing.
2. Compressor not large enough for job.
3. Loose fittings.
4. Hose or hose connections too narrow.
5. Crankcase oil too thick.
6. High altitude reducing air output.
1. Check inlet and outlet filters.
Clean and/or replace as needed.
2. Check if accessory CFM is met by Compressor.
If Compressor cannot supply enough air flow (CFM),
you need a larger Compressor.
3. Reduce air pressure, then check all fittings with
a soap solution for air leaks and tighten as needed.
Do not overtighten.
4. Replace with wider hose and/or hose connections.
5. Drain oil and refill to proper level with recommended oil.
6. Higher altitudes require compressors with greater output.
Overheating 1. Air filters need cleaning/replacing.
2. Crankcase oil too thin or incorrect type.
3. Crankcase oil level too low.
4. Unusually dusty environment.
5. Unit not on level surface.
1. Check inlet and outlet filters.
Clean and/or replace as needed.
2. Drain oil and refill to proper level with recommended oil.
3. Add oil to proper level, check for leaks.
4. Clean and/or replace filters more often or
move unit to cleaner environment.
5. Reposition unit on a level surface.
Excessive noise 1. Loose fittings.
2. Loose or damaged belt guard.
3. Crankcase overfilled with oil or oil
is incorrect thickness or type.
4. Crankcase oil level too low.
5. Unit not on level surface.
1. Reduce air pressure, then check all fittings with a soap
solution for air leaks and tighten as needed.
Do not overtighten.
2. Replace belt guard.
3. Drain oil and refill to proper level with recommended oil.
4. Add oil to proper level, check for leaks.
5. Reposition unit on a level surface.
Moisture in
discharge air
Too much moisture in air. Install inline air filter/dryer, and/or relocate
to less humid environment.
Air leaks from
pump or fittings
Loose fittings. Reduce air pressure, then check all fittings with a soap
solution for air leaks and tighten as needed.
Do not overtighten.
Oil in discharge
air or high oil
consumption
1. Crankcase oil too thin or
crankcase overfilled with oil.
2. Unit not on level surface.
3. Crankcase vent clogged.
1. Drain oil and refill to proper level with recommended oil.
2. Reposition unit on a level surface.
3. Clean Crankcase vent.
) I(::(A)5::)058,/4)*+,F52/1(.0)A7,.,-,+)615E.(01.E)(+)0,+-1F1.E)/7,)F(9*+,00(+D)))
X10F(..,F/)*(A,+)02**:4)B,8(+,)0,+-1F,D

Page 14 I(+)/,F7.1F5:)J2,0/1(.0K)*:,50,)F5::)LM===M=NNM<O?OD Item 58494
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TUG"PG)#G"X)'^G)IVUUV!%$&)S"#GI\UUQ
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR
MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS
QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE
ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY
STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND
LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY
ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS
THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
#,F(+6)T+(62F/]0)P,+15:)$29B,+)^,+,;)
$(/,; If product has no serial number, record month and year of purchase instead.
$(/,; Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts. Specify UPC 193175440341 when ordering parts.

Page 15I(+)/,F7.1F5:)J2,0/1(.0K)*:,50,)F5::)LM===M=NNM<O?ODItem 58494
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T5+/ X,0F+1*/1(. j/4
1 Tube with Compression Nut 1
2 Elbow 1
3 Socket Head Cap Screw, M6x40 8
4 Washer, M6 8
5 Cylinder Head 2
6 Cylinder Head Gasket 2
7 Valve Plate Assembly 2
8 Cylinder Gasket 2
9 Filter 2
10 Ring Set 2
11 Tee Fitting 1
12 Piston 2
13 Rod 2
14 Cylinder 2
15 Nut, M8 8
16 Lock Washer, M8 13
17 Stud Bolt, M8 8
T5+/ X,0F+1*/1(. j/4
18 Crankcase Gasket 2
19 Oil Breather Washer 1
20 Oil Fill Plug 1
21 Oil Sight Glass with O-Ring 1
22 Oil Drain Plug 1
23 Crankcase 1
24 Bearing 6204 1
25 Crankshaft 1
26 Bearing 6205 1
27 Oil Seal 1
28 Gasket Front Cover 1
29 Carrier 1
30 Bolt, M8 4
31 Flywheel 1
32 Flat Washer 1
33 Bolt, M8 1
34 Oil Breather 1
)T5+/0)U10/)5.6)X15E+59

U191/,6)?a)X54)!5++5./4
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for the
period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly,
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper
installation, normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries
to persons or property, or for incidental, contingent, special or consequential damages arising from the use of
our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges
prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise.
If our inspection verifies the defect, we will either repair or replace the product at our election or we may
elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will
return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
`N<>L)"E(2+5)#(56))k))S5:5B5050K)S")?Lla`))k))LM===M=NNM<O?O