Bad shimmy in steering HZJ75
Submitted: Sunday, May 08, 2016 at 12:40
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Have been experiencing a real bad shimmy in the front steering of our troopy, usually around 80-90kph. Its especially bad when towing and up hills, figured maybe coz less weight on front?
Have had the wheels balanced but no difference.
Today I decided to
check the king pin bearings. So I disconnected both drag links and felt the smoothness of the movement in the hubs. They were very notchy.
After stripping the hub to investigate I found both the king pin bearings and the CV joints were very notchy.
I'm really hoping that if I fix this this will be the route of the shimmy in the steering. Any ideas?
Also I rebuilt the hubs about 40k ago with new bearings, seals and CV joints.
We shipped this car and travelled around the world. On the road we had an issue with the spindle needle bearing, it disintegrated and sent metal through the hub. We had it apart on the side of the road many times trying to sort the issue I'm guessing this has caused the premature failure of the CV and King pin bearings. Particularly because cleaning out the hub and relubricating everything properly was a challenge whilst on the road. We were in the middle of the Pamir mountain range in Tajikistan when it happened!
Reply By: Bob Y. - Qld - Sunday, May 08, 2016 at 14:24
Sunday, May 08, 2016 at 14:24
The rollers in the kingpin cones wear into
the cups, in the straight ahead position, causing the rollers to jump in & out of the grooves, which in turn causes a vagueness while driving along straight roads. Feel this is only part of you shimmy problem..........
That shimmy, from my experience, is more likely to be the (drag link)tie rod ends, that is the adjustable, repairable joints. Worthwhile replacing these anyway, after your OS trip. They're only about $20 each. Don't know what would have caused the needle rollers to collapse, unless they were lacking in lubrication, or some other stress factor. Would the axle housing be bent at all? Might be worth checking it?
We've never had any more king pin dramas after we started pumping grease into the hub, through that small threaded plug hole, about 20 strokes every 10K kms. However, it's sensible maintenance to replace king pin brgs every 100K, if used regularly in rough or severe conditions.
As Alan suggested a new damper won't go astray.
Good luck,
Bob.
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Reply By: Member - ross s - Sunday, May 08, 2016 at 19:51
Sunday, May 08, 2016 at 19:51
On my troopy, I have had issues with a steering shimmy that could have been solved from fixing a variety of items. First thing that made the situation better was castor correction wedges after a 2inch lift ( was actually more like 3..) Swivel hub rebuild ( bearings,seals ect). Made a difference. Replaced tyres.. better. Got rid of cheap sunrasier rims for "better" set. Changed
suspension bushes from neoprene back to rubber. Now all good. Drives very
well now. Not sure what actually made it good but all these things have been done. On occasion when a small shake has appeared it has been a re torque of the hub retaining nut that has sorted it. In have also replaced the drag link/ tie rod ends and steering dampener. I have had both standard and rtc steering dampeners, with 33inch tyres, and haven't felt very different. Good luck.
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