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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:
E
Grainger Parts Operations
N
P.O. Box 3074
G
1657 Shermer Road
L
Northbrook, IL 60065-3074 U.S.A.
I
S
H
Figure 7 — Replacement Parts Illustration for Model HUK-501
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
Intermediate tube
CONSTANT SPEED UNLOADING
INSTRUCTIONS FOR HEAD
UNLOADERS (MODEL HUK-501)
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
C439-C
(Ref. Drawing)
Part
Ref.
No.
Qty.
No.
11
S20HUB2
4
12
P2306B
4
13
P2287A
4
14
P2547A
4
15
P2286A
4
16
NI183
4
17
P1882A
4
18
M926A
8
19
M919A
8
P08461B
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
Actuating tube
Compression body
Compression fitting
Compression body
Pilot valve assembly
Pilot mounting bracket
Branch tee
Hex head cap screw
Manifold tube
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".
3Z241D
1/16" WHEN
PISTON IS UP
C440-A
(Ref. Drawing)
Part
No.
Qty.
P08463B
1
M2868
1
M2862
1
M2863
1
M2855
1
M807
1
M2879
3
M3465
1
P12556A
2
Sensing
tube
1
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