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Topic: Fan motor disassembly (Read 819 times) previous topic - next topic

Fan motor disassembly

I decided to put this under its own heading to keep things simple.  Yesterday I removed the fan blades, using a breaker bar and an air impact wrench.  Next, I removed the nut from the center of the hub before attaching a puller I bought from Harbor Freight years ago (photo).  With the puller, it came off pretty easy.  The dark area is from the penetrating oil, not a leak.  I took a number of photos of the motors with brackets, before I took them apart - I will need them for reference when putting it back together.  Today, I'm sanding down the brackets and prepping them for paint.  In the next day or so, I will empty the hydraulic reservoir and try to remove the hoses - again, more photos and colored tape with notes.  I would never remember how it all goes back.
I used the air impact wrench for all the nuts and bolts.
2000 U320 mid entry  #5688
2006 Jeep Liberty


USMCR retired
SDFD retired
FEMA US&R TF8

Re: Fan motor disassembly

Reply #1 –
Just a thought, maybe go back with new bolts? Also, if you are going

to replace the hydraulic oil Tractor Supply has had it on sale, if you have

one of their stores near you.

Carter-

Re: Fan motor disassembly

Reply #2 –
His hyd. system uses Delo 15/40 or equivalent.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Fan motor disassembly

Reply #3 –
I plan on replacing all the bolts with stainless - Lowe's seems to have a good supply.
2000 U320 mid entry  #5688
2006 Jeep Liberty


USMCR retired
SDFD retired
FEMA US&R TF8

Re: Fan motor disassembly

Reply #4 –
Careful on stainless they are not as strong as a medium strength steel bolt.

Any marks on the old bolt heads?
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Fan motor disassembly

Reply #5 –
Get a jar of anti-seize and do every nut and bolt.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: Fan motor disassembly

Reply #6 –
Use Grade 5 or 8, they will work fine, John is right about anti-sieze.  Stainless is pretty and does not rust; but it is soft (think peanut butter) some stainless is harder than others, just not the off the shelf ones.

John
John and Stacey Smith
Motorcade NO: 11973
1997 U295 CSGI 40'..Build No. 5036     
920 Watts on the roof..CAT Power w/fuel Inj. Programmer
2021 GMC Sierra AT4 1500
EX..2015 Jeep Wrangler Sahara
Ex 1990 U280 RSAI 36'..Build No. 3638

Re: Fan motor disassembly

Reply #7 –
Bear in mind that stainless steel is more reactive with aluminum (assuming motors are aluminum frame) than carbon steel.  I'd use never-seize rated for aluminum and steel bolts instead.
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: Fan motor disassembly

Reply #8 –
Grade eight are brittle. 
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Fan motor disassembly

Reply #9 –
Generally speaking correct, but not always true... ARP 300 series stainless are stronger than grade 8 (180,000 psi vs 170,000 psi). These are primarily what I used on my basement rebuild project (about 76 of them give or take).
Don
Quote from: Caflashbob –
Careful on stainless they are not as strong as a medium strength steel bolt.

Any marks on the old bolt heads?
The selected media item is not currently available.
Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: Fan motor disassembly

Reply #10 –
Quote from: Caflashbob –
Grade eight are brittle.
That's all Caterpillar used in heavy equipment
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Fan motor disassembly

Reply #11 –
Could not use grade eights to hold a scattershield over a clutch long ago as the flywheel failure hitting them sideways would cause them to break.  Long ago.  Too long ago maybe
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Fan motor disassembly

Reply #12 –
Bob,

    I would use grade 8 bolts if I were repairing a lawn mower. They are too close in price to

a grade 5. I try to fix someting and forget it. I have built and rebuilt machinery over the years and

can not remember a single failure of a grade 8, properly used.  As far as the point of being brittle

I remembered a hand out I had in a course that debunked the brittle aspect and since it is not a

copyrighted item I am attaching it.

Carter-


I've also heard the argument that grade 8's are more brittle than grade 5's and that's why you shouldn't use them. Well, first you need to understand what the term "brittle" really means. Brittleness in bolts is defined as failure at stresses apparently below the strength of the bolt material with little or no evidence of plastic deformation. Typically, fasteners are not brittle below 180 ksi ultimate tensile strength. Grade 5's have an ultimate tensile strength of 120 ksi and a grade 8 fastener has an ultimate tensile strength of 150 ksi. This is why brittle is a relative term. Nearly all fasteners are considered ductile except some made from PH 15-6 Mo, 17-4 PH and 17-7 PH

Re: Fan motor disassembly

Reply #13 –
Kool just remembering my old NHRA rule book. 

No supertainium either in racing then. 

The stainless will be probably work great.

What did Foretravel use oem?
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Fan motor disassembly

Reply #14 –
Quote from: Caflashbob –
Kool just remembering my old NHRA rule book. 

No supertainium either in racing then. 

The stainless will be probably work great.

What did Foretravel use oem?
I am using grade 8 for flywheel, scattershield, torque convertor and bellhousing.
Mr. Gasket Flywheel and Pressure Plate Bolts | JEGS

Mr. Gasket Flywheel and Pressure Plate Bolts | JEGS
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Fan motor disassembly

Reply #15 –
My concern about the strength of bolts has more to do with shear strength vs torque.  I would not think a great deal of strength would be required to hold the fan brackets (frame) in place.  Rather than use anti-seize, I'm more likely to use Loctite, since I would not anticipate having to  disassemble them again.  I could also go with steel bolts and use rubberized undercoating.
2000 U320 mid entry  #5688
2006 Jeep Liberty


USMCR retired
SDFD retired
FEMA US&R TF8

Re: Fan motor disassembly

Reply #16 –
Blue loktite(242) is what I would use on cleaned or new bolts and retapped holes then brake cleaned then blown out with air pressure

Can be disassembled later
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Fan motor disassembly

Reply #17 –
A trick a Cat mechanic told me was to use clear finger

nail polish if you could not find anything else.

Carter-