Just another Moderator
Join Date: Sep 2005
Location: New Westminster, BC
Thanked 317 Times in 302 Posts
Rep Power: 10
With the old (black) ST4000 drive unit, you just pry the halves apart. One half has a slight retaining "rib" that snaps over the rollers. This is just one of the weak areas of this era of drive unit. Over time, the weight of the drive motor can put pressure on this part, and things shift a bit causing binding.
Try supporting the motor drive with a zap strap or some such.. usually the wheel brake shaft is a convenient support point for this. We got an extra couple of seasons out of ours that way, even though a couple of the rollers had broken off.
As mentioned previously, RM has greatly improved the design with the newer (gray) drive units.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)