Graco LubeMaster, Instructions Manual

Page: 21 / 44

Maintenance and Repair
3A2781A 21
15 Amp Low-Level Switch Assembly Option
Refer to F
IG
. 15 for reference numbers used in the fol-
lowing instructions.
If the oil level runs low and the assembly fails to perform
as required, the unit may have to be disassembled to
replace a defective switch assembly.
Before disassembling, check all electrical connections to
make sure they are secure and check for any physical
obstruction which might be preventing the float from
operating.
Disassembly
1. Disconnect all electrical power and all air supplies to
the lube system.
2. Remove cover (9) from reservoir (11).
3. Unscrew union nut (304c) from switch adapter
(304a).
4. Unscrew switch adapter (304a) from switch (304).
5. Remove actuating rod, part of low-level lower
assembly (304f), from remaining assembly.
6. Unscrew low-level lower assembly (304e) from
low-level adapter (304b).
7. Unscrew low-level adapter (304b) from reservoir
cover.
8. Remove low-level adapter (304b) from union nut
(304c).
Assembly
The following procedure is used for installing a new
assembly in a reservoir. If your assembly was removed
for repairs, Steps 1 and 2 do not apply.
1. Remove cover (9) from reservoir (11).
2. Remove 1/4 inch plug (7) from reservoir cover (9).
3. Insert low-level adapter (304b) into union nut (304c).
4. Screw low-level adapter (304b) into the reservoir
cover (9) and tighten securely.
5. Screw low-level lower assembly (304e) into
low-level adapter (304b) and tighten securely.
If float portion of low-level lower assembly was removed
during disassembly, apply Loctite
®
to the attaching bolt
and securely attach the float to the arm.
6. Insert the actuating rod, part of low-level lower
assembly (304e), into this assembly.
7. Screw switch adapter (304a) into switch (304) and
tighten securely.
8. Screw union nut (304c) onto switch adapter (304a)
and tighten securely.
9. Install cover (9) on reservoir (11).
10. Wire switch (304) in accordance with local electrical
codes. Refer to wiring diagram (F
IG
. 16).
A Normally closed
B Normally open
C Common
F
IG
. 15
304
304a
9
304b
304e
304c
304f
F
IG
. 16
C
B
A