I've been 'rebuilding' my 48" deck for the past few weeks, taking off the rust, applying Slip Plate, and installing a new idler arm bolt with grease fitting. This deck came with a 149 that I rarely use for mowing, so the deck has sat in the shed for a few years. This deck has the spindles with the aluminum casting and replaceable roller bearings, as opposed to the ST-745 sealed bearing spindles. The spindles on the left and right of the deck were mounted with the aluminum casting under the deck, and the center spindle had the aluminum casting on top of the deck. A few weeks ago it was mentioned that all of these castings should be under the deck.
So I’m putting the deck back together and I mount the center spindle under the deck. When I attach the cutting blade I noticed that it is ¾” below the other two blades. Was it like this before and I didn’t notice it? So I disassemble and find that the center spindle is ¾” longer than the left/right spindles (5 ¾” vs 5”). Looking through my files I find Roland Bedell’s May 17, 2005 message about having two different size spindles, ¾” difference, and he didn’t understand why. At this point I don’t know why either. Figuring the previous owner installed the wrong spindle, I bought a 5” spindle (part no. 759-3370) at my local Cub Cadet store.
Then it struck me that maybe the longer spindle is needed when the aluminum casting is mounted on top of the deck, and the shorter spindle is for under deck mountings. Sure enough that’s how it works.
Here is a photo showing three spindle types, from top to bottom:
the 5 ¾” spindle – part number might be 759-3369 and might be the alternate to the ST-746.
the 5” spindle – part number 759-3370.
and a broken 5” sealed bearing spindle ST-745.
Now to my question. When I bought the new 5” spindle 759-3370 it came with an oil/grease seal which I thought was odd. What has got me confused are the instructions to install the seal open side turned up. I’ve never seen that before, and the other seals on my decks all have the closed side facing outwards. Can anyone explain the reasoning, and does it really make a difference?
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spindle kit
Spindle Shaft 759-3370.pdf (65.5 k)</td></tr></table></center>