Subject: missing reverse 5HP30 TSB Author: shogun (moderator) : member since March, 2004 : 16327 posts Posted on: 2010-02-11 23:40:14

Technical Service Information

BMW ZF 5-HP-30 NO REVERSE COMPLAINT:
1991 and later BMW vehicles equipped with the ZF 5-HP-30 transmission may exhibit a no reverse condition, when selector lever is placed into reverse.
The cause may be, the .236" diameter checkball located in the bathtub in the channel plate has blown through the spacer plate, which will now exhaust "F" clutch (Reverse) oil pressure.

Install a .250" diameter plastic checkball into the bathtub in the channel plate as shown in Figure 1. The holes in the spacer plate over the bathtub measure .198" and the larger diameter checkball will greatly decrease the probability of this condition occuring again.
There is also ample room in the bathtub for the increased diameter checkball to perform its duties. Refer to Figure 1. Figure 2 illustrates the location of the only other checkball in this
unit and do not install checkball in the location marked "X".
The checkball wearing and blowing through the spacer plate causing the loss of reverse, may also have caused some damage to the "C" Clutch which is also on in reverse. This condition has also been known to create damage to the "A"/"C" Clutch Housing as well. If the clutch housing has been severly damaged, aluminum material will be evidenced in the bottom pan upon inspection. When the unit is removed and the "A"/"C" Clutch Housing is dis-assembled, it is not uncommon for the unit to set for over a week waiting on parts. When re-assembling it is very easy to mis-assemble the "B" Clutch Hub on top of the retaining snap ring for the "A" Clutch pack. This mis-assembly will create a neutralizing on the 3-4 upshift, and the Trans light will begin flashing.
Ensure that you assemble the "B" Clutch Hub on top of the "A" Clutch stack, and then install the "A" Clutch Pressure Plate and snap ring, as shown in Figure 3.
details with drawings here:

http://www.europeantransmissions.com/Bulletin/DTC.BMW/98-61.pdf

E32 750iL 11/88, E32 750iL Highline 03/90
SHOGUN'S TRICKS AND TIPS FOR THE SEVEN SERIES

• 5hp30 whines and no reverse - mrat928s4 2010-02-10 21:10:36 (533 views)
  • Re: 5hp30 whines and no reverse - DrSnooz 2010-02-12 22:48:39 (549 views)
  • Re: 5hp30 whines and no reverse - Shayne 2010-02-10 23:34:51 (443 views)
    • question.. - rv8flyboy 2010-02-11 09:31:46 (400 views)
      • Re: question.. - Shayne 2010-02-11 10:18:22 (440 views)
        • 2 pumps?? I'll be darned (url) - rv8flyboy 2010-02-11 10:48:34 (372 views)
          • Re: 2 pumps?? I'll be darned - Shayne 2010-02-12 13:09:02 (431 views)
        • THANKS!! (nt) - rv8flyboy 2010-02-11 10:28:31 (399 views)
          • missing reverse 5HP30 TSB (url) - shogun 2010-02-11 23:40:14 (661 views)
            • Shane, can u please point out the position of the second pump??? (nt) - rv8flyboy 2010-02-12 11:58:30 (404 views)
              • 1 pump, Shayne corrected in above post (nt) - shogun 2010-02-13 02:12:38 (413 views)