Ransomes Marquis mk4 (or 4a?) - grass ejection?
My Marquis has never ejected the cut grass very cleanly. It only hits the grass box squarely if the clippings are quite short, and the revs rather high (probably 3mph walking pace). Otherwise, with longer grass, or lower revs, the clippings fall short of the box, and are "recycled" by the cutting cylinder.
I read the manual (posted by wristpin, thank you!) for the earlier model with the Clinton engine, and it speaks of adjusting the "concave" (*). However, when I tried moving the concave mount points up and down, and no time did the concave move anywhere near the cylinder, certainly not anything like the 1/16" clearance the manual speaks of.
Can anyone advise?
BugBear
(*) You can tell Ransomes made threshing engines...
Forums
Damn, that's hard to
Damn, that's hard to photograph.
Here's the gallery link:
http://s48.photobucket.com/user/bugbear33/library/misc/concave
BugBear
Couldn't find them on that
Couldn't find them on that link, can you post them direct to the forum please?
Link works for me, but some
Link works for me, but some browsers and/or computers do have issues with Photobucket links. I have a PB account, but I don't have to be logged in to see those images.
I have found Imgur to be free of such issues.
That said, uploading photos to the Forum means that they avoid being subject to deletion/broken links later on.
That cylinder looks pretty
That cylinder looks pretty low in the tooth to me and the gap between the concave and the chassis seems to bear this out. I think you need to find a new one.
Looks lower in one pic than
Looks lower in one pic than another but overall looks low! Can you give us an average depth of blade above the supporting webs?.
I shall attempt to measure
I shall attempt to measure cylinder height above the webs, and overall diameter.
If anyone has tips for measuring the latter, I'm all ears.
BugBear
Not that easy with an
Not that easy with an installed cylinder but perhaps measure half and double it!?
(all in mm)
(all in mm)
Web -> cylinder distance 6.00
Shaft diameter 19.12
Shaft -> cylinder distance 51.16
So radius = 19.12/2 + 51.16 = 60.74, diameter = 121.44, or 4.78"
What's a new one's full diameter (he asked, nervously)?
EDIT: the manual for the mk1, mk2 posted by wristpin give 5 1/8", so I'm 0.345" down on diameter, about 9mm, or 5mm off radius.
BugBear
Hmm, I have known them get
Hmm, I have known them get lower than that and still work, are these measurements all way across ? What I am trying to get at, could the cylinder be tapered ?
Could there be anything wrong with the bottom blade ? it should have a pronounced lip, but I have known people fitting a auto-certes bottom blade to a marquis in an attempt to get them to cut closer.
This is a 20" Marquis
This is a 20" Marquis cylinder although, due to the rather rough welding, I suspect that it is a pattern part rather than a Ransomes original. Anyway, the diameter is 125mm
So I'm only 3.5mm down on
So I'm only 3.5mm down on diameter, roughly 2mm on radius. That can't be a problem, surely?
BugBear
I would try "flattening" the
I would try "flattening" the throw plate a bit so that in line with the cylinder shaft it is 2mm or so away from the blades but is wide at the top so that the thrown grass travels in a higher arc to land further into the box. Also, maybe take a lighter cut.
If the cutting cylinder has
If the cutting cylinder has been re-ground many times it will have lost diameter and have reduced ability to throw the grass. The brackets that secure the throw plate / concave may be reversed to move it closer to the cylinder and the concave itself can be "flattened" so that it is close to the blades in line with the cylinder shaft but not "curled" around at the top and restricting the trajectory of the throw.
A few images may shed some light on the matter.