Who's Online Now
0 members (), 11 guests, and 28 robots.
Key: Admin, Global Mod, Mod
Newest Members
Thomas, Glen, pustekonto, Simon, Nbmod
403 Registered Users
Forum Statistics
Forums23
Topics353
Posts4,491
Members403
Most Online248
Mar 14th, 2020
Popular Topics(Views)
61,007 77-MGB
53,196 2020 Gardens
Top Posters
sonny 1,394
JIM 1,304
GatorS 249
Nnaatz 163
GLyford 110
Doc 68
chma 43
February
S M T W T F S
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
Well I got a bit too pushy last week operating a skid steer mower, its a cheapie RB auction Mower King skid steer 'brush mower' hydraulic powered skid steer loader attachment,

[Linked Image from kuhnbros.com]

So I broke a blade in half trying to cut down a 3"diameter tree near a fenceline..the blade fractured and went flying in to the woods, had to shut it down as unbalance and vibration was crazy with only one blade.
So I'll have to make some new blades for this mower. I got new 5/8" grade 8 hardened bolts to hold on the new blades.
Not pictured is I turned up some new heavy pattern washers on the lathe from some 4140 steel stock for the mounting bolts.
[Linked Image from kuhnbros.com]

I needed to replace BOTH blades for this mower due to balance issues and wanted to upgrade from 1/4"thick originals to a heavier blade as well while I'm at it.
I went to the LWS steel shop but they wanted $80 for a section of 4"wide,1/2"thick steel flat to make new blades from, but I knew there was a cheaper way...
so I pulled a section of 1/2" thick plate from my plate stock, always good to have 'inventory' to draw upon.
[Linked Image from kuhnbros.com]

Got out the track torch to cut the 1/2"steel plate, it's been a while since I ran this old beast from the 60's..good old unit that still gets results..smooth edges a lot nicer than trying to free hand burn plate.
When you get one of these running right you can make cuts with very little grinder cleanup necessary..it takes a bit of setup and seat time to run one but gives a great finish.
You can see the hand burned edge at the bottom of the plate vs. the smooth cut the track torch gives..
Anyway I got this without track sections, I had to make two sections of track, they bolt together for long cuts..here we are just using one 6ft.section.
They were a PITA to make with the groove machined in the top,I had a machinist do it at work 20yrs ago on an old 50's Gorton milling machine.
[Linked Image from kuhnbros.com]

Got the plate section cleaned up and cut to length, 14" long sections..cleaned up with grinder.
[Linked Image from kuhnbros.com]

Drilled the 1-1/4" hole for the anchor bolt, it was a close as I could get to the metric 30MM hole as the original blades had..I drilled
both together to keep the dimensions as close as possible..The original blades had a bend or offset bent into them, I left the new blades straight
so I could drop the mower flat on the ground and not have the new blades hit the ground..they clear by about 4" where the originals hit the ground.

The metal cylindrical thing in the foreground on the drill press is a magnetic chip grab,great for drilling,you pull the chips off the drill press and then pull
the handle back over the trash can, the knob moves the magnet inside the tube away from the metal chips and they drop into the trash..about 25yrs old still works great on steel
[Linked Image from kuhnbros.com]

Then brought the blades back for a second pass thru the track torch to cut the cutting angles instead of grinding for HOURS on end to cut the edges.
It's trickier than you think to set this up twice for both edges with no guide blocks or jigs to hold the blades..all by eye..
they are bush hog blades after all but we always try for accuracy whenever we can
[Linked Image from kuhnbros.com]

So I did do some cleanup work on the belt grinder and wheel, more to come as thats enough for a Saturday..time to drink some beer for now
[Linked Image from kuhnbros.com]

more to come on this..broke the root rake as well, got some upgrades to do there too

Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
got both blades finished and installed, drilled the 5/8" Grade 8 mounting bolts for cotter retention pins and installed them both..hopefully this will last the next brushy go-round..one of the original metric blade mounting bolts had stripped threads..great time to replace them with the Grade 8s. Somewhat complex but easy project completed in time for turkey day..Happy Thanksgiving

[Linked Image from kuhnbros.com]

1 member likes this: sonny
Joined: Jan 2019
Posts: 1,394
Likes: 10
MBN veteran
Online Content
MBN veteran
Joined: Jan 2019
Posts: 1,394
Likes: 10
Thats exactly like the one my neighbor bought! Dont think he was going to beat up brush with his, --- just mow grass/weeds at the showgrounds.
Your new blades should work great!


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
they have replacements online for $200, had to make my own, have plate have torch lets burn some iron

Joined: Jan 2019
Posts: 1,394
Likes: 10
MBN veteran
Online Content
MBN veteran
Joined: Jan 2019
Posts: 1,394
Likes: 10
Your homemade ones will be better than bought ones for sure!


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
the bought blades online are plasma cut from AR500 steel, it is 200,000psi yield-a whole lot better wearing than standard A36 plate with 40,000psi yield like I made mine from..with 1/2" thick plate now it'l take a while to wear 'em down,and I left extra steel around the attaching bolt area,thats where the stock blades failed..plus I didnt wanna spend 200

Joined: Jan 2019
Posts: 1,394
Likes: 10
MBN veteran
Online Content
MBN veteran
Joined: Jan 2019
Posts: 1,394
Likes: 10
Not spend 200 more on a NEW mower!! --- This will test the rest of the mower and if it holds up you can always buy the new blades on down the road.


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
ohh, it got tested Sonny, i just pushed it wayyy beyond its cheap thin metal chimna build..wanted to see what it would do..well a 4-5in tree was too much, i tried easing into it and got halfway thru it, but moving forward with the machine the front end dipped down and pitched the mower hard into it which blew/broke the blade off. The blade was made with minimum steel around the mounting bolt hole..i guess to allow it to break off as a safety element. I think it will do now for brush and small stuff but not 4-5in trees..even witht he new bunkclimber brand turbo blades we'll take it easy on it..prolly blow the mower gearbox up next LOL

Joined: Jan 2019
Posts: 1,394
Likes: 10
MBN veteran
Online Content
MBN veteran
Joined: Jan 2019
Posts: 1,394
Likes: 10
YA!---- gearbox would be my concern! LOL!


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
the gearbox looks like I could replace it with any standard bush-hog type 540pto box, maybe just with a little shim plate or height adjustment..

Joined: Jan 2019
Posts: 1,394
Likes: 10
MBN veteran
Online Content
MBN veteran
Joined: Jan 2019
Posts: 1,394
Likes: 10
I kinda wonder if they do use common/standard stuff on some of the machines.


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
the brush mower hyd. drive motor looks to be Chinese origin copy of a Charlynn; I dont know if its splined or just a keyed shaft.. and the gearbox a copy of a old design mower gearbox..the hyd drive motor has a provision for a case drain,it wasnt plumbed, most aren't- just plugged off as this costs them money to plumb, and they cut costs by just plugging it off..between the hose and adapters+quick coupler plus shipping it was another $100 just to do that but it will save the motor in the long run. I put synthetic 80/90 in the gearbox but now methinks the seal got trashed due to a half mile of heavy poly film getting wrapped around the rotor when mowing a field, it got so hot it fused together,what a friggin mess..so now in the spring I'll flip it upside down and inspect the seal and shaft,have to mike it up and find a replacement double lip seal by size..

Joined: Jan 2019
Posts: 1,394
Likes: 10
MBN veteran
Online Content
MBN veteran
Joined: Jan 2019
Posts: 1,394
Likes: 10
Hopfuly its standard seals and you can match them.


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Joined: Jan 2019
Posts: 110
Likes: 6
MBN member
Offline
MBN member
Joined: Jan 2019
Posts: 110
Likes: 6
I usually hear "corn head grease" recommended for mower gearboxes. (aka 0 or 00 grade)

Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
not sure on the corn head grease Glyford..it survived 4hrs of beating with the 80w90..Ill check it again in the spring Im done with it for now

Joined: Jan 2019
Posts: 1,394
Likes: 10
MBN veteran
Online Content
MBN veteran
Joined: Jan 2019
Posts: 1,394
Likes: 10
They say that the cornhead grease stays in gearboxes better/longer! The IH combine had that I had ,--- had that stuff in it and I ran for 5 or 6 years without adding any to the head boxes on it.
I never used it in anything else so dont know!


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Joined: Jan 2019
Posts: 757
Likes: 57
B
MBN old hand
OP Offline
MBN old hand
B
Joined: Jan 2019
Posts: 757
Likes: 57
the gearbox on the mower only has a 1/2" npt port for adding oil. the owners manual states add 'oil' thru the port..with no mention of what viscosity to use..typical chinma manual.
for now the synthetic 80w90 will do it,the seals just have a seep to them,class 1 leak. I'll reinvestigate it in the spring


Link Copied to Clipboard
Recent Topics
chainsaw trailer
by sonny - 02/20/2024 09:06 AM
greenhouse build
by sonny - 02/18/2024 10:00 AM
What odd jobs did you do today?
by sonny - 02/12/2024 11:16 AM
Member check in.
by sonny - 02/12/2024 11:13 AM
hydraulic cylinder port modifications
by bunkclimber - 02/11/2024 03:11 PM
Getting back in the saddle...
by sonny - 02/08/2024 12:04 PM
IH 574 tractor/loader
by JIM - 01/27/2024 08:04 AM
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Today's Birthdays
There are no members with birthdays on this day.
Donation Box
Powered by UBB.threads™ PHP Forum Software 7.7.5