Sundstrand Series 40 Neutral Adjustment
The changes affect the M91 and M46 variable displacement pumps & motors that have mechanical displacement controls in them.The changes to the neutral adjustment cap screw and star lock screw is that they are using a locking flangehead cap screw. You also don’t have to have a washer with this type of screw.
The serial number A-87-28-xxxxx
The part number 9007276-0123
When you are repairing new units, use new screws.
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