MLU FORUM  

Go Back   MLU FORUM > MILITARY VEHICLES > The Softskin Forum

Notices

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 03-05-15, 14:03
cordenj's Avatar
cordenj cordenj is offline
Registered User
 
Join Date: Mar 2009
Location: Surrey UK
Posts: 168
Default Chevrolet C60s - Front Wheel "shimmy"

I'd welcome any thoughts on why this is happening and suggestions for curing it.

Tyres: 10 x 20 Bar grips (good secondhand)

Wheels: standard splitrims. I have had the two front wheels professionally balanced in an attempt to cure this. One wheel required significant number of lead weights to be pronounced suitably balanced. Had hoped that would cure it, but sadly not.

Tyre Pressure: 43psi in each side

Symptoms: At any speed above 20 mph the front wheels can suddenly start to violently "shimmy", usually triggered by a pot-hole (of which we have many in UK!). Slowing down causes the "shimmy" to slow and stop and the truck can then be driven on without coming to a complete halt. I say it is violent because the steering comes "alive" and when viewed from outside the cab appears to shake.

Checks I've carried out so far:
1. Checked tyre pressures to be 43psi

2. Checked wheel balance weight still on rims

3. Checked toe-in by stretching thin cord across face of fitted tyres and aligned to rears as I would for the Jeep. Very slightly "toed-in" - about 3/8 in . Manual say should be zero.

4. Camber: With wheels jacked off the ground, measured camber with spirit level. Found LHS wheel to lean out 1 1/4 in across the diameter of the tyre.
RHS wheel lean out just 1/4 in.

I probably should I check these again with the wheels on the ground, but is this a significant difference on these trucks?

5. Steering: With wheels jacked off the ground, about 2 inches movement in steering wheel rim before wheels start to move. Is this within reasonable limits for a CMP C60? My Jeep has similar play but does not shimmy.

6. Wheel bearings: with wheels jacked up, wheels rotate freely and there is no obvious play when the top of each wheel is pulled in and out.

7. Steering tie-rod: levered rod to see if any excessive play or movement. None visible.


Any thoughts or ideas based on experiences with these trucks are very welcome as the truck isn't driveable for any distance like this.

Many thanks
__________________
John.
1944 Chevrolet C8a HUP ZL-2
1944 Willys MB (British Guards Armoured Div);
1944 BSA Folding Bicycle (Best "Para Bike" at War&Peace Show 2011, 2012, 2014 and 2015);
Trailer, 10cwt, Water Lightweight, 100 gall;
Trailer, 10cwt, Cargo Lightweight 10cwt No1 MkII;
Trailer, 10cwt, Electrical Repair Mk.2; Ex-Airborne REME;
Trailer, 10cwt, Lightweight, Electric Welding Mk 2;
SOLD:1943 Chevrolet C60s Wrecker
Reply With Quote
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Chev and Ford 15cwt front "D" differences Keith Webb The Softskin Forum 14 24-12-21 18:51
Motor Oil: "Riding the Film" 1937 Chevrolet Engine Lubrication Hanno Spoelstra The Softskin Forum 2 21-01-14 10:27
"2 friends in front of 3 Jeeps" Harry Moon The Softskin Forum 6 14-08-12 16:19
New Book: "Amazing Airmen": "Canadian Flyers In The Second World War" RAF21 WW2 Military History & Equipment 1 27-11-09 03:30


All times are GMT +2. The time now is 18:19.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright © Maple Leaf Up, 2003-2016