Bunn ULTRA - Shaft Seal Maintenance

Ultra Training Manual
30
□ Remove the #8 locking screw on the lower right side (viewed from front) of the auger motor mounting bracket
securing the auger motor run capacitor. Set capacitor aside with wires attached.
□ Disconnect the auger motor terminal from the terminal on the main wiring harness.
□ Remove the remaining #8 locking screws securing the cooling drum mounting bracket. Remove motor with
mounting bracket.
Note: When removing or installing motor and shaft assemblies, be sure the split pins are turned to a position
that will clear the torque sensor circuit board.
□ Pull the auger shaft assembly straight out of cooling drum. Inspect the shaft for abnormal wear.
□ From the front of dispenser, remove the seal and blue bushing from cooling drum and discard them.
□ Clean seal and bushing surfaces of the cooling drum very thoroughly.
Lubricant is not required on any of the seals or bushings.
□ Refer to Figure 1, and slip new blue bushing into cooling drum.
□ Place seal on insertion tool as shown in Figure 2. Make sure open
face of seal is toward cooling drum.
□ Push seal into bore until it is rmly seated; remove tool.
□ Place a small amount of “Krytox” lubricant (provided in kit in a plastic
cap) on the end of the motor shaft (about 1 1/2”) and a thin lm in the
groove. Install auger shaft assembly onto the motor shaft. See Figure
3. Do not use too much “Krytox” lubricant. This is the only place “Kry
tox” lubricant is used.
□ Assemble motor/shaft assembly as shown in Figure 3, then install
assembly into cooling drum. Make sure the pins do not hit the sensor
board and cooling drum seal is not dislodged as the shaft passes
through.
□ Secure motor and capacitor to the cooling drum mounting bracket.
Install rear motor cover.
□ Refer to the Installation and Operating Manual for hopper assembly
and installation procedures. Install new hopper/drum seals and faucet
seals included in the kit. See Figure 1 and 4.
□ Remove and clean condenser air lter. See Figure 5.
□ Refer to the Installation and Operating Manual, “Menu Function Index”.
Scroll to menu “PM Complete?” and answer “YES” to reset the reminder
message “PM Due”.
Figure 2
Seal Insertion Tool
Open face of seal away
from tool
Cooling Drum Seal
Figure 3
Lube about 1
1
/
2
” of shaft and in the
groove with BUNN P/N: 29563.0000
“Krytox” Lubricant
Auger Shaft Assy
Figure 4
Faucet Seal
Figure 5