Disassemble ST4000 MK2 wheel unit

P

Project_Mayhem

.
Sep 24, 2018
4,529
Catalina 30 MKIII Chicago
I noticed the motor on my autopilot was a bit loose today. There were no obvious screws holding the two halves of the housing together. Are they held together by the same screws that are holding it to the wheel? Asking before losing a few dozen ball bearings in to the water.

On a side note, if anyone has some play between the peg on your pedestal and the hole in the wheel unit, a couple pieces of heatshrink worked very nicely. Hopefully no more clunk sound
 
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C

Calif. Ted

.
Jun 8, 2004
3,012
Catalina 320 Dana Point
The bearings are held in a very lightweight black plastic matrix, I pulled one apart to discover the plastic had broken and the bearings were loose. It was non-functional at that point anyway, made crunching sounds when turning the wheel.
 
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jssailem

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
24,581
CAL 35 Cruiser #21 moored EVERETT WA
In 2021, I rebuilt my EV 100 Autopilot. It uses the 4000MK2 wheel assembly. I used the same Chinese electric Motor that Greg used. Bought it on Amazon. I first thought it was the motor. I learned that the failure was the drive ring. Here is my parts discovery.

EV-100 Autopilot 4000Mk2 Wheel Drive Repair

When it comes to selecting an autopilot, if your boat has a displacement weight less than 16,500 lbs, the Raymarine EV-100 is a likely option under consideration. It was the primary option when I explored my first AP. Now that I am 5 years into use with about 2000 nm usage I have had to do a...
forums.sailboatowners.com
 
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