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Champion Operating Instructions & Parts Manual
For Replacement Parts, call 1-800-323-0620
24 hours a day - 365 days a year
Please provide following information:
-Model number
-Serial number (if any)
-Part description and number as shown in parts list
Address parts correspondence to:
Grainger Parts Operations
P.O. Box 3074
1657 Shermer Road
Northbrook, IL 60065-3074 U.S.A.
E
N
G
L
I
S
H
C444-B
(Ref. Drawing)
Figure 7 — Replacement Parts Illustration for Model HUK-401
Head Unloader.
Replacement Parts List for Optional Head Unloader Kit
Ref.
No.
Description
1
Intake manifold
(Replaces S-20B2)
2
Cylinder
3
Piston
4
O-ring
5
Piston rod
6
Claw
7
Spring
8
1/4"-28 Lock nut
9
1/4" Lock washer
10
Manifold tube
CONSTANT SPEED UNLOADING
INSTRUCTIONS FOR HEAD
UNLOADERS (MODEL HUK-401)
NOTE: This is optional equipment and
is not included on unit. The purpose
of constant speed unloading is to
provide a means of stopping or
starting the electric motor or
gasoline engine after each cycle. To
accomplish this, an air pilot valve is
Part
Ref.
No.
Qty
No.
11
S20HUB2
2
12
P2306B
2
13
P2287A
2
14
P2547A
2
15
P2286A
2
16
NI183
2
17
P1882A
2
18
M926A
4
M919A
4
Z9172
1
•
used to replace the pressure switch
used for stop-start operation. The
pilot valve senses storage tank
pressure, and when the pressure is
raised to a pre-determined setting,
this air is released to an intake valve
hold-open mechanism. The
compressor stops compressing air and
runs free until the pilot valve senses
that the pressure in the tank has
dropped to
12
TYPICAL
MANIFOLD
ASSEMBLY
When installing head unloader
manifold assembly,be certain that the actuating claw
(Ref. No. 6), protrudes 1/16" below the bottom of the
manifold (Ref. No. 1), as shown. Claw must be
positioned so that it will enter two slots in the
compressor valve. Failure to follow this procedure
will result in an inoperative head unloader.
Description
Branch tee
Actuating tube
Pilot valve assembly
Compression fitting
Hex head cap screw
Pilot mounting bracket
Compression fitting
Compression fitting
1/4" O.D. to suit installation
the predetermined setting. At this
time the air is released from the
intake valve hold open mechanism
and the compressor starts
compressing air again. The parts
called out above replace or are
substituted for those found in the
regular parts list of the "Operating
Instructions & Parts Manual".
3Z172
1/16" WHEN
PISTON IS UP
C440-A
(Ref. Drawing)
Part
No.
Qty
M2879
3
P12323A
1
M2855
1
86A40
1
M3465
1
M807
1
M2868
1
M2868
1
Sensing
tube
1
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