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Furnace problems

Hi everyone,
 Both furnaces not working on my coach. The bedroom furnace keeps tripping the breaker at the furnace itself.
 The second needs the motor replaced. I can't seem to break it free from the wheel, however!
 Is it possible that the breaker from the bedroom furnace is tripping due to the frozen motor on the other furnace? Is the wiring all connected?
 Ideas on breaking the shaft free from the fan?
 Any help is appreciated,  thanks!
1994 U240 3116 Cat 6 speed Allison transmission

Re: Furnace problems

Reply #1 –
Quote from: Brettforfreedom –
Hi everyone,
 Both furnaces not working on my coach. The bedroom furnace keeps tripping the breaker at the furnace itself.
 The second needs the motor replaced. I can't seem to break it free from the wheel, however!
 Is it possible that the breaker from the bedroom furnace is tripping due to the frozen motor on the other furnace? Is the wiring all connected?
 Ideas on breaking the shaft free from the fan?
 Any help is appreciated,  thanks!
Disconnect, electrically, the non-functioning motor, and see what happens.
Tim Dianics
Pam Sapienza
Vader PupZilla Labrador Canine Beast (AKA Pup)
Columbia, MO
1996 U320 4000
2021 Jeep Gladiator, Diesel

Re: Furnace problems

Reply #3 –
 The motor has a 1/8 hex set screw holding it on. You can access it with an extra long allen in between the fins at the rear bearing. Rotate the motor to find it. It's there.
1994 U280, Build 4490
Deming, NM.

Re: Furnace problems

Reply #5 –
The furnace that pops the breaker can you turn the fan by hand? Maybe a mud dauber built a nest that is keeping it from turning.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: Furnace problems

Reply #6 –
Quote from: Twig –
The motor has a 1/8 hex set screw holding it on. You can access it with an extra long allen in between the fins at the rear bearing. Rotate the motor to find it. It's there.
I removed it and it still refuses to budge!
1994 U240 3116 Cat 6 speed Allison transmission

Re: Furnace problems

Reply #8 –
Spray it with PB Blaster and let it soak for a few hours ....... or better yet...... overnight. 
Justin & Cathy Byrd
1995 U280 "Old Faithful"
36' Build #4673
C8.3 Cummins
Allison MD3060R 6 speed - retarder
Powertech 10KW  4cyl Kubota

Re: Furnace problems

Reply #9 –
Quote from: Brettforfreedom –
Still popped the breaker. 😔

All electricity flows through the thermal relay.  Two contacts for the thermostat. Two for power, one in that is always hot and one out for the furnace.
1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
1983 Honda VF750C
Charlie, the Dog was broken out of jail 24 Oct 2023
N1RPN
AA1OH (H)e who must be obeyed.