Capacitors; Gearbox - Stoelting F431 Service Manual

5. Using a straightedge, align the drive motor pulley
with the gearbox pulley. Tighten the two allen
head screws.
6. Install wiring according to wiring diagram (located
behind header panel). Install electrical cover plate.
7. Install protective shield.
8. Install back and side panels.
6.4

CAPACITORS

The compressor start and run contactors are mounted
behind the side panels. The start and run capacitors for the
drive motors are mounted directly onto each motor body.
Run
Capacitor
Start
Capacitor
Figure 6-6 Compressor Capacitors
A. CAPACITOR TEST
1. Disconnect machine from electrical supply before
removing any panels for servicing.
WARNING
Hazardous voltage
The Main Freezer Power switch must be placed in
the OFF position when disassembling for servicing.
The machine must be disconnected from electrical
supply before removing any access panel. Failure
to disconnect power before servicing could result
in death or serious injury.
2. Place the Main Power OFF/ON switch and both
Freezing Cylinder OFF/ON switches in the OFF
position.
3. Remove a lead from one of the capacitor terminals.
4. Using insulated pliers, discharge the capcitor
by connecting a 20KΩ 5W resistor across the
terminals.
Discharge the capacitor even if there is a bleeder
resistor across the terminals. There may be an open
in the bleeder resistor preventing it from working
properly.
NOTE
5. Disconnect the bleeder resistor from the circuit.
6. Check the capacitance across the terminals. Refer
to the table below for the correct readings.
Drive Motor Start 231095
Drive Motor Run 231078
Compressor Start 231079 145-174 MFD
Compressor Start 230649 130-156 MFD
Compressor Run 231084
Compressor Run 230633
B. CAPACITOR REPLACEMENT
1. Disconnect machine from electrical supply before
removing any panels for servicing.
2. Place the Main Power OFF/ON switch and both
Freezing Cylinder OFF/ON switches in the OFF
position.
3. Remove leads from the capacitor terminals.
4. Using insulated pliers, create a short across the
capacitor terminals with a 20KΩ 5W resistor to
discharge the capacitor.
Create the short even if there is a bleeder resistor
across the terminals. There may be an open in the
bleeder resistor preventing it from working properly.
5. Pull the capacitor out of its holder and replace.
6. Connect the leads to the terminals.
6.5

GEARBOX

A. GEARBOX INSPECTION
Inspect the gearbox and listen for unusual noise. A grind-
ing sound generally indicates a bad gear.
B. GEARBOX REMOVAL
1. Disconnect machine from electrical supply before
removing any panels for servicing.
2. Remove the back panel and the side panel (of
the side being removed).
3. Remove protective shield from side of machine.
4. Remove the belts.
5. Remove the pulley by loosening the set screws.
6. Remove the three bolts holding the gearbox to
the barrel.
4. Remove the two bolts holding the gearbox to
the mounting bracket and remove the gear box
through the rear of the machine.
47
Rating
Part MFD
500 MFD 125 VAC
50 MFD 370 VAC
220 VAC
250 VAC
30 MFD 370 VAC
30 MFD 370 VAC
NOTE
VAC