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Jerking helper side wheel


mackniac
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a new problem occured

Mack RB688S

1990

E7-400

camel back 46K

multi-leaf shackle spring 18K

dump truck

the helper side tire is jerking up & down empty around 60 to 65 km(37 to 40 mph) and then get lot worst when loaded at around 70 km( 45 mph) . wheel seems to jump up & down tapping on the road . The steering is not jerking no feel of shimmy in the steering .

The truck stays straight does not feel like it is going to bring me in the ditch nothing wobbles.

what did I checked

1- tires are good (not broken not used abnormaly)

2- tires been balanced

3- tire from helper side went to driver side and vice versa ( same problem)

4- king pin been check and seems to have normal play

5- bearing been check seems good too

6- spoke wheel been checked seems good too

7- brake drum been checked seems good too

8- schock absorber been checked seems good too

9- tie rod end are sound

10- all spring leaf are ok no cracks not broken

11- all power steering rods and all others rods are sound

12-

one thing that I found is that the shackle seem to be very close ( 1/8 )(see attached pics with the red arrow) to the rear holder helper side ,

on the oposite side (driver ) it is aroud 3/4 of an inch of space , also there is a play in the front pin of the front

shackle .

some people are telling it can be drive shaft related ( wich I checked and accordind to my knowledge all the plays seems to be within normal) .

anyone had a similar problem ?

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Makniac , collector and customizer of die-cast model in 1/50th scale

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Sounds like everything has been checked except the kitchen sink!

Has this problem just come on all of sudden? Is the problem the same under power or coasting?

Worn spring pins and bushings would wear over time, but by the list that would be the next item to check.

How is the rubber in the carrier bearing mount? It can look good without dry cracking and be too spongy. That might give the driveshaft a chance to whip a little.

Jim

Jim

It doesn't cost anything to pay attention.

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Sounds like everything has been checked except the kitchen sink!

Has this problem just come on all of sudden? Is the problem the same under power or coasting?

Worn spring pins and bushings would wear over time, but by the list that would be the next item to check.

How is the rubber in the carrier bearing mount? It can look good without dry cracking and be too spongy. That might give the driveshaft a chance to whip a little.

Jim

I am with Jim, if the spring pins are bad/worn out that's where I would start. How did you check the driveline there should be no movement at all. maybe a pinch of movement at the carrier bearing.

Robert

"I reject your reality and substitute my own."

 

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