WIRING
STEP I
STEP 3
Use 14 gauge stranded wire to 20’, 12 gauge to 50’, Install 10-15 amp fuse protection on the positive lead for from
power source. the -143 model, use a 7 amp fuse for the -343 and a 5
STEP 2
amp fuse for -443 model.
Use a 10-15 amp rated on-off switch on the (+) positive (red)
motor lead.
TROUBLESHOOTING
WARNING: BEFORE SERVICING PUMP, TURN OFF PUMP AND DRAIN WATER FROM SYSTEM!!
Failure to Prime -
Motor operates, but no pump discharge
• Restricted intake or discharge line
• Air leak in intake line
• Debris in pump
• Punctured pump diaphragm (pump leaks)
• Crack in pump housing
Motor falls to turn on
• Loose wiring connection
• Pump circuit has no power
• Blown fuse
• Pressure switch failure
• Defective motor
Pump Fails to Turn Off After All Fixtures Are Closed
• Empty water tank
• Insufficient voltage to pump (low battery)
• Punctured pump diaphragm (pump leaks)
• Discharge line leak
• Defective pressure switch
Low Flow and Pressure
• Air leak at pump intake
• Accumulation of debris inside pump and plumbing
• Worn pump bearing (excessive noise)
• Punctured pump diaphragm (pump leaks)
• Defective motor
Pulsating Flow
• Restricted pump delivery. Check discharge lines, fittings and valves
for clogging or undersizing
Quite often when a pump is worn or defective the one failed component has overburdened others. To avoid frequent aggravating
repairs, Flojet offers service kit assemblies making repairs as quick and easy as possible.
DISASSEMBLE
Upper Housing
1. Remove switch (9). Disconnect switch wires.
Upper Housing
2. Loosen but do not remove four pump head screws andcarefully
remove upper housing assembly (1)
3. Inspect check valve (2) for debris
4. Reassemble new upper housing (1)
Check Valve Assembly
Follow steps 2 and 3
3. Replace check valve (2)
4. Reassemble upper housing (1)
Lower Housing, Diaphragm, Motor
Follow step 2, then slide rubber foot from mounting track.
3. Rotate lower housing (4) so mounting notch opening on
lowerhousing exposes set screw which holds bearing
housing to shaft.
4.
Loosen this set screw by inserting wrench 1/8” Allen
wrenchinto mounting notch opening. Then, slide lower
housing (4) off motor shaft.
Diaphragm Cont’d
5. Loosen four cam piston screws with Phillips head screw driver
and pull apart cam from inner pistons. (Pistons should always
be replaced when a new diaphragm is installed.)
Motor Cont’d
5. Replace Motor
REASSEMBLE
Motor
1. Reassemble lower housing assembly (4) to motor. (Follow
steps 4 to 10.)
Diaphragm
2. Lower housing is assembled with:
• Flat side of diaphragm and outer pistons facing motor
• Hex stem of inner pistons must be aligned into hex holes inouter
pistons (4).
• Outer pistons must be aligned with alignment slots on
camassembly making sure screw holes align in cam assembly,
otherwise diaphragm will leak.
3. Tighten cam piston screws partially, center piston
indiaphragm, then tighten screws securely (18 in. lbs. torque)
Lower Housing
4. Reassemble lower housing assembly (4) to motor.
