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Search: Posts Made By: Harvard
Forum: Country Coach Owners Forum 01-19-2021, 09:49 PM
Replies: 7
Views: 476
Posted By Harvard
Having too little front end positive caster will...

Having too little front end positive caster will manifest itself as a dead "do nothing" zone between left and right steering at highway speeds. Too little +caster is roughly anything less then +5.5...
Forum: MH-General Discussions & Problems 01-19-2021, 02:46 PM
Replies: 28
Views: 964
Posted By Harvard
We once had a weird problem with an RV furnace....

We once had a weird problem with an RV furnace. Turns out there was an oil filled p-trap in the copper line to the furnace. The symptoms depended on the outside air temperature which caused changes...
Forum: Workhorse and Chevrolet Chassis Motorhome Forum 01-03-2021, 10:28 AM
Replies: 74
Views: 3,195
Posted By Harvard
Estimating Caster

https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28154264.cfm
Forum: Ford Motorhome Chassis Forum 01-02-2021, 12:31 PM
Replies: 71
Views: 3,216
Posted By Harvard
On the 99 F53 there is a start relay located on...

On the 99 F53 there is a start relay located on the aft side of the radiator mount accessible via the passenger side fender well. This 12V relay coil requires a case to ground/chassis electrical...
Forum: Ford Motorhome Chassis Forum 12-31-2020, 11:22 AM
Replies: 71
Views: 5,080
Posted By Harvard
Starting to see examples of F53s at +7 plus some.

Starting to see examples of F53s at +7 plus some.
Forum: Ford Motorhome Chassis Forum 12-31-2020, 10:16 AM
Replies: 22
Views: 788
Posted By Harvard
and what was the caster set at ?

and what was the caster set at ?
Forum: Vintage RV's 12-30-2020, 07:20 PM
Replies: 5
Views: 259
Posted By Harvard
POPULAR MECHANICS MAY 1973: START QUOTE: If...

POPULAR MECHANICS MAY 1973:
START QUOTE:
If too little caster exists, the car will wander and weave,
thus necessitating constant corrections in steering.
END QUOTE:

Too little +caster will...
Forum: Ford Motorhome Chassis Forum 12-30-2020, 05:50 PM
Replies: 22
Views: 788
Posted By Harvard
Dropping the rear (or raising the front) adds to...

Dropping the rear (or raising the front) adds to the +caster.
Dropping the front (or raising the rear) subtracts from the +caster.
IMO.
Forum: Ford Motorhome Chassis Forum 12-30-2020, 05:32 PM
Replies: 22
Views: 788
Posted By Harvard
+ caster

One of the lesser known aspects of +caster which I learned the hard way.
Too little +caster, at highway speeds, creates a steering dead "do nothing" zone between left and right. This aspect is...
Forum: Ford Motorhome Chassis Forum 12-30-2020, 03:48 PM
Replies: 22
Views: 788
Posted By Harvard
From their web site, "Sumo Springs help to...

From their web site, "Sumo Springs help to maintain your truck's level attitude."

Did you have a nose up attitude or a nose down attitude that the Sumo Springs were installed to correct to a...
Forum: Ford Motorhome Chassis Forum 12-30-2020, 11:25 AM
Replies: 22
Views: 788
Posted By Harvard
For Example: Given: 2011 F53 Caster Spec...

For Example:

Given: 2011 F53 Caster Spec 3.75 +/-1,75 Degrees

This specifies a range of +2.0 to +5.5 Degrees

Logical Interpretation:

+2.00 Degrees for 100% city driving
...
Forum: Ford Motorhome Chassis Forum 12-30-2020, 10:31 AM
Replies: 22
Views: 788
Posted By Harvard
If the offending unit has a noticeable nose down...

If the offending unit has a noticeable nose down attitude I might suspect too little +caster as being involved.
Forum: Class C Motorhome Discussions 12-06-2020, 10:52 AM
Replies: 33
Views: 1,473
Posted By Harvard
In all likelihood there is a lot of plumbing...

In all likelihood there is a lot of plumbing outside below floor level which is never heated. So, you cannot survive the nights.
Forum: Ford Motorhome Chassis Forum 12-04-2020, 08:02 PM
Replies: 71
Views: 5,080
Posted By Harvard
You should research positive caster alignment....

You should research positive caster alignment. For example:

Good Sam Club Open Roads Forum: Class C Motorhomes: Interpreting Caster Alignment Specs...
Forum: Country Coach Owners Forum 12-04-2020, 04:30 PM
Replies: 58
Views: 8,440
Posted By Harvard
Highway handling with too little positive caster

FYI

https://www.irv2.com/forums/f112/steering-issues-on-my-40-cc-1992-a-516089-2.html#post5538630

Too little caster creates a dead "do nothing" zone between left and right. The driver has...
Forum: Country Coach Owners Forum 12-04-2020, 11:59 AM
Replies: 25
Views: 937
Posted By Harvard
Here is a link to phil-t who is driving an F53...

Here is a link to phil-t who is driving an F53 (22.5 inch wheels, solid axel) with casters set in the 7 to 8 degree range:

Good Sam Club Open Roads Forum: Class A Motorhomes: Interpreting...
Forum: Ford Motorhome Chassis Forum 12-03-2020, 04:01 PM
Replies: 71
Views: 5,080
Posted By Harvard
Did you ever resolve these "handling"...

Did you ever resolve these "handling" issues?
Forum: Country Coach Owners Forum 12-02-2020, 11:12 AM
Replies: 25
Views: 937
Posted By Harvard
The range and specs given would be spit out by...

The range and specs given would be spit out by the alignment machine. Just be aware a range of +2 to +5 could also be documented as 3.5 +/-1.5 Degrees.

When you approach an alignment service...
Forum: Country Coach Owners Forum 11-30-2020, 10:31 AM
Replies: 25
Views: 937
Posted By Harvard
I am going to rescind the 3 degree wedges...

I am going to rescind the 3 degree wedges recommendation because we are dealing with larger wheels. One degree of caster change on a larger wheel creates a larger change in the caster trail then does...
Forum: Country Coach Owners Forum 11-29-2020, 08:45 PM
Replies: 25
Views: 937
Posted By Harvard
Personally I would not hesitate to add 3.0 Degree...

Personally I would not hesitate to add 3.0 Degree caster wedges.
LH 2.89 + 3.0 = +5.89 Degrees
RH 3.10 + 3.0 = +6.10 Degrees

I do not think you have the option NOR the need to change camber.
Forum: Country Coach Owners Forum 11-29-2020, 06:34 PM
Replies: 25
Views: 937
Posted By Harvard
This is a typical "tweak the toe and we are good...

This is a typical "tweak the toe and we are good to go" alignment.

The chassis mfg has recommended a caster range of +2.0 to +5.0 degrees.
In layman terms, this range can be interpreted as:
...
Forum: Workhorse and Chevrolet Chassis Motorhome Forum 11-29-2020, 02:52 PM
Replies: 74
Views: 3,195
Posted By Harvard
Camber and Tire Wear

IMO, the camber setting will influence the tire wear profile CAUSED by the wear due to incorrect TOE. If the toe is set correctly there will be no abnormal tire wear caused by any reasonable amount...
Forum: Workhorse and Chevrolet Chassis Motorhome Forum 11-29-2020, 02:42 PM
Replies: 74
Views: 3,195
Posted By Harvard
Yeloduster said: I"'m still trying to wrap my...

Yeloduster said:
I"'m still trying to wrap my mind around how changing caster on a solid axle changes camber!?"

The change in camber is real but too miniscule (0.4*) for all practical...
Forum: Country Coach Owners Forum 11-29-2020, 02:29 PM
Replies: 25
Views: 937
Posted By Harvard
To put it in different words: Almost...

To put it in different words:

Almost every "too little caster" handling post starts out with wandering and an uncomfortable feeling at highway speeds.

Once the caster has been increased...
Forum: Class C Motorhome Discussions 11-29-2020, 09:22 AM
Replies: 18
Views: 862
Posted By Harvard
Some E350/E450 RVs have handling issues, some do...

Some E350/E450 RVs have handling issues, some do not, the following may explain the difference:

Ford ships all E350/E450 cut aways with identical fixed, non adjustable caster/camber sleeves,...
Forum: Country Coach Owners Forum 11-28-2020, 10:40 PM
Replies: 25
Views: 937
Posted By Harvard
No. For a given amount of caster, the faster you...

No. For a given amount of caster, the faster you go the more the caster effect. (The faster you go the more the vehicle wants to go in a straight line.) If you have too little caster to begin with...
Forum: Workhorse and Chevrolet Chassis Motorhome Forum 11-28-2020, 03:55 PM
Replies: 74
Views: 3,195
Posted By Harvard
Thank you Fishmaine for your follow up post. ...

Thank you Fishmaine for your follow up post.

I am sure you will find your next return trip (AZ to Maine) much more relaxing. Safe travels. :thumb:
Forum: Country Coach Owners Forum 11-28-2020, 03:19 PM
Replies: 25
Views: 937
Posted By Harvard
Here is a link to a recent experience with a...

Here is a link to a recent experience with a caster change to a solid front axel

https://www.irv2.com/forums/f22/more-workhorse-handling-issues-513565-2.html#post5537005


FWIW, the caster...
Forum: Country Coach Owners Forum 11-28-2020, 10:32 AM
Replies: 25
Views: 937
Posted By Harvard
When it comes to interpreting the caster...

When it comes to interpreting the caster specification, think outside the box. For example, given 3.0 +/-0.75, shoot for 3.75 which is better then 3.0.
Forum: Country Coach Owners Forum 11-27-2020, 04:40 PM
Replies: 25
Views: 937
Posted By Harvard
POPULAR MECHANICS MAY 1973: START QUOTE: If...

POPULAR MECHANICS MAY 1973:
START QUOTE:
If too little caster exists, the car will wander and weave,
thus necessitating constant corrections in steering.
END QUOTE:


Too little caster creates...
Forum: Class C Motorhome Discussions 11-25-2020, 02:51 PM
Replies: 15
Views: 772
Posted By Harvard
X2: "Also check the air line where it...

X2:

"Also check the air line where it enters the top of the air bag with the soapy water. If the line isn't seated well it will leak."

That happened to our rig.
Forum: Class C Motorhome Discussions 11-18-2020, 04:00 PM
Replies: 74
Views: 6,447
Posted By Harvard
You probably have too little +caster. Here is a...

You probably have too little +caster. Here is a link to our experience, circa 2010.

E350/E450 Handling Problems are caused by too little + CASTER...
Forum: Workhorse and Chevrolet Chassis Motorhome Forum 11-13-2020, 10:26 AM
Replies: 74
Views: 3,195
Posted By Harvard
The parts (wedge shims) required to adjust the...

The parts (wedge shims) required to adjust the caster on a solid axel are common and are readily available.


I set my toe to be about 1/16 to 1/8 inch using a tape measure so I would expect...
Forum: Workhorse and Chevrolet Chassis Motorhome Forum 11-09-2020, 10:28 AM
Replies: 74
Views: 3,195
Posted By Harvard
Symptoms of too little caster.

The symptom of having too little caster is "loose steering".

Loose steering is where you have a dead "do nothing" zone between left and right.

Here is a link to my experience, circa...
Forum: Class C Motorhome Discussions 11-07-2020, 09:07 AM
Replies: 36
Views: 3,725
Posted By Harvard
Get as much caster as you can get, ie you may be...

Get as much caster as you can get, ie you may be able to get up to 6.2 degrees.
Forum: Workhorse and Chevrolet Chassis Motorhome Forum 11-04-2020, 10:40 AM
Replies: 74
Views: 3,195
Posted By Harvard
POPULAR MECHANICS MAY 1973: START QUOTE: If...

POPULAR MECHANICS MAY 1973:
START QUOTE:
If too little caster exists, the car will wander and weave,
thus necessitating constant corrections in steering.
END QUOTE:
Forum: Class C Motorhome Discussions 10-22-2020, 10:39 AM
Replies: 25
Views: 1,372
Posted By Harvard
When we lived on an acreage we used to leave the...

When we lived on an acreage we used to leave the engine hood open when stored off season. The theory being that mice do not like to be exposed.
Forum: Class C Motorhome Discussions 10-21-2020, 01:49 PM
Replies: 4
Views: 366
Posted By Harvard
If you started out with about 2.8 and 3.0 you...

If you started out with about 2.8 and 3.0 you should feel quite a difference. IMO
Forum: Class C Motorhome Discussions 10-21-2020, 10:51 AM
Replies: 4
Views: 366
Posted By Harvard
What did they set your caster at ?

What did they set your caster at ?
Forum: MH-General Discussions & Problems 10-16-2020, 04:36 PM
Replies: 23
Views: 905
Posted By Harvard
The siphon/sucking by the water pump will not...

The siphon/sucking by the water pump will not happen unless there is an open valve/tap downstream to give the contents in the water pump a place to go.
Forum: Class C Motorhome Discussions 10-12-2020, 02:57 PM
Replies: 9
Views: 610
Posted By Harvard
El Paso is about 4000 Ft ASL Yuma is about...

El Paso is about 4000 Ft ASL
Yuma is about 100 Ft ASL

Makes a big difference in winter OAT
Forum: Ford Motorhome Chassis Forum 10-12-2020, 11:43 AM
Replies: 8
Views: 723
Posted By Harvard
Ford ships all E350/E450 cut aways with identical...

Ford ships all E350/E450 cut aways with identical fixed, non adjustable
caster/camber sleeves, "one size fits all". You can recognize these sleeves because they are keyed and cannot be rotated. They...
Forum: MH-General Discussions & Problems 09-09-2020, 10:06 AM
Replies: 109
Views: 8,906
Posted By Harvard
Normally, on a gasoline engine, the block heater...

Normally, on a gasoline engine, the block heater has its own 3 prong 120VAC power cord and is not normally plugged into a RV power outlet.
Forum: Ford Motorhome Chassis Forum 09-04-2020, 10:32 AM
Replies: 13
Views: 487
Posted By Harvard
The top of the upper ball joint has a sleeve that...

The top of the upper ball joint has a sleeve that has a fixed setting (fixed trail) established on the Ford assembly line. These fixed sleeves must be changed out to adjust the trail (+caster angle)...
Forum: MH-General Discussions & Problems 09-02-2020, 09:51 AM
Replies: 109
Views: 8,906
Posted By Harvard
In terms of current the GFCI senses the...

In terms of current the GFCI senses the difference between H and N current. If the H current is about 6 mA greater then N current, it trips. Where did the missing current go? The missing current had...
Forum: MH-General Discussions & Problems 08-31-2020, 07:34 PM
Replies: 109
Views: 8,906
Posted By Harvard
This also has me thinking and I have come up with...

This also has me thinking and I have come up with a theory. If the Generator HOT is shorted to the RV CHASSIS there could be some CHASSIS to EARTH EMF (Electric Field) by virtue of stray capacitance....
Forum: Ford Motorhome Chassis Forum 08-29-2020, 10:03 PM
Replies: 13
Views: 487
Posted By Harvard
I would suggest one step at a time. My first step...

I would suggest one step at a time. My first step would be a caster setting in the range of +5.5 to +6.0 degrees. That will reduce the "loose steering" where there is a noticeable dead "do nothing"...
Forum: MH-General Discussions & Problems 08-27-2020, 04:52 PM
Replies: 109
Views: 8,906
Posted By Harvard
How does the GFCI know the difference between a...

How does the GFCI know the difference between a light bulb between HOT and NEUTRAL and a Human Body between HOT and NEUTRAL?
Forum: MH-General Discussions & Problems 08-27-2020, 04:27 PM
Replies: 109
Views: 8,906
Posted By Harvard
Sorry, I realized a "short" vs "conductive path"...

Sorry, I realized a "short" vs "conductive path" was open to misinterpretation. The edit was done after your text capture.
Forum: MH-General Discussions & Problems 08-27-2020, 04:03 PM
Replies: 109
Views: 8,906
Posted By Harvard
So this would imply a human body providing a...

So this would imply a human body providing a conductive path between HOT and NEUTRAL would not be detected by the GFCI. Thus, it seems a path to Ground/Earth is required for a GFCI to function...
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