Graco Lube Master, Instructions Manual

Page: 20 / 44

Maintenance and Repair
20 3A2781B
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 is too low and the assembly fails to per-
form as required, the pump assembly may have to be
disassembled to replace a defective switch assembly.
Before disassembling, check that all electrical connec-
tions are secure and check for any physical obstruction
preventing the float (304h) from operating.
Disassembly
1. Follow Prepare for Maintenance , page 16.
2. Remove the cover (9) from the reservoir (11).
3. Unscrew the union nut (304c) from the switch
adapter (304a).
4. Unscrew the switch adapter (304a) from the switch
(304).
5. Remove the actuating rod (304e), part of low-level
lower assembly (304f), from the remaining assem-
bly.
6. Unscrew the low-level lower assembly (304f) from
the low-level adapter (304b).
7. Unscrew the low-level adapter (304b) from the res-
ervoir cover.
8. Remove the low-level adapter (304b) from the union
nut (304c).
Reassembly
The following procedure is used for installing a new
assembly in a reservoir. If the assembly was removed
for repairs, Steps 1 and 2 do not apply.
1. Remove the cover (9) from the reservoir (11).
2. Remove 1/4 in. plug (7) from the reservoir cover (9).
3. Insert the low-level adapter (304b) into the union nut
(304c).
4. Insert the low-level adapter (304b) into the reservoir
cover (9) and tighten securely.
5. Place the low-level lower assembly (304e) into the
low-level adapter (304b) and tighten securely.
If the float (304h) from the low-level lower assembly was
removed during disassembly, apply medium strength
thread lock to the attaching bolt and securely attach the
float (304h) to the arm (304f).
6. Insert the actuating rod (304e), part of low-level
lower assembly (304f), into this assembly.
7. Place the switch adapter (304a) into the switch
(304) and tighten securely.
8. Insert the union nut (304c) onto switch adapter
(304a) and tighten securely.
9. Install the cover (9) on the reservoir (11).
10. Wire the switch (304) in accordance with local elec-
trical 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
304h
F
IG
. 16: Wire Switch
C
B
A