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Installation, Operations & Maintenance Manual
4.5.2 Installation of Feedback Potentiometer
1. Install replacement potentiometer assembly.
Apply very slight pressure and align teeth
of gear to lay inside groves of nylon gear.
Do not force gears together overly tight or allow
teeth to lay on top of worm gear teeth. Tighten
two retaining screws. There should be slight
pressure between gears.
2. Apply a very small amount of lithium grease
(if needed to motor shaft nylon worm gear.
Motor shaft may have grease from previous
maintenance.
3. Compare wire colors of new feedback
potentiometer connector to wire colors of old
feedback potentiometer connector. When
placement of wires is different install jumper
cable (ordered with new feedback potentiometer)
between P2 and J2
(Figure 13)
.
4. Install PCB (Paragraph 4.4.2).
5. Perform calibration A.
4.6 NYLON WORM GEAR REPLACEMENT
4.6.1 Removal of Nylon Worm Gear
1. Apply power and set pump stroke adjust knob to
0% setting or remove power and manually turn
the pump stroke adjust knob to 0% setting.
ALWAYS DISCONNECT
ELECTRICAL POWER FROM
THE PUMP MOTOR AND ECC BEFORE PERFORMING ANY
MAINTENANCE. FAILURE TO FOLLOW THESE INSTRUCTIONS
COULD RESULT IN DEATH OR SERIOUS INJURY.
2. Disconnect power from ECC.
3. Remove PCB (Paragraph 4.4.1).
4. Remove feedback potentiometer
(Paragraph 4.5.1).
5. Remove screw that secures capacitor
(65) (if installed) to ECC. Slide capacitor to one
side away from nylon worm gear (190). Leave
wires attached.
6. Using a 3/32 punch, push out spring pin holding
nylon gear on shaft. Remove gear.
4.6.2 Installation of Nylon Worm Gear
1. Slide new nylon worm gear (190) over motor
shaft and align shaft holes to gear holes with
3/32 punch. Being careful not to damage nylon
worm gear, press spring pin (200) through holes
in gear and shaft. Place pin equal distance from
both sides of gear.
ALWAYS DISCONNECT
ELECTRICAL POWER FROM
THE PUMP MOTOR AND ECC BEFORE PERFORMING ANY
MAINTENANCE. FAILURE TO FOLLOW THESE INSTRUCTIONS
COULD RESULT IN DEATH OR SERIOUS INJURY.
2. Reinstall capacitor (65) (if removed). Tighten
screw. Do not allow wires to be pinched under
capacitor.
3. Install feedback potentiometer
(Paragraph 4.5.2).
4. Install PCB (Paragraph 4.4.2).
5. Perform calibration A.
4.7 MOTOR REPLACEMENT
4.7.1 Removal of Motor
1. Apply power and set pump stroke adjust knob to
0% setting or remove power and manually turn
the pump stroke adjust knob to 0% setting.
2. Disconnect power from ECC.
3. Disconnect ECC from pump. Remove four bolts/
screws that mount ECC to bracket and carefully
remove ECC from pump.
4. Disconnect gear box (mRoy
®
A and B has no
gear box) from ECC. Remove four screws that
mount gear box to ECC and carefully remove
gear box from ECC.
5. Clean grease from gear located at bottom of
motor shaft. Using a 1/8 punch push out spring
pin holding gear and slide gear off shaft. Retain
gear and spring pin. Parts will be used during
installation of new motor.
SECTION 4 - MAINTENANCE
