Scag Hydro

Scag Hydro

PostBy: Coalfire On: Sun Jun 15, 2014 4:57 pm

Saturday I found a 2008 Scag tiger Cub 61" deck 25hp Kohler, with blown head gaskets. I was able to score this and both gaskets for $1650 :o , awesome shape dealer was just wanted to unload it to busy to run through the shop. Anyway checked on trade in value and low trade in is $4800 so I got a little room to play.

Did not take long had the gaskets replaced and mowed my whole yard. Now that is where the problem comes in the the left side will go backwards cold for about a minute than only has forward, however going forward has no problem going up a very steep bank or chewing the grass on take off, so I would say the wheel motor is probably fine, and I would believe the hydro is also good, that more than likely it is the valving inside the hydro pump. Anyone ever have one of these apart? or do I need to take the pump to a hydro shop?


Thanks for any info, Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: Scag Hydro

PostBy: 009to090 On: Sun Jun 15, 2014 5:01 pm

Nice find!!!
Try changing out the hydro fluid and filter first. Use the fluid that's called for in the manual.
009to090
 
Stoker Coal Boiler: EFM 520 HighBoy
Hot Air Coal Stoker Stove: DVC-500 x 2
Coal Size/Type: Anthracite Rice

Re: Scag Hydro

PostBy: Coalfire On: Sun Jun 15, 2014 5:12 pm

009to090 wrote:Nice find!!!
Try changing out the hydro fluid and filter first. Use the fluid that's called for in the manual.



20w-50 automotive oil is what it calls for so the side benefit of that is its cheap. It was low on oil when I got it real low (sorry forgot to mention that :oops: ) So I filled her up with two and a half quarts, it only holds three. Did not change filter wanted to make sure everything else was fine. Was just looking see you can get a seal kit for these things .


Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut


Re: Scag Hydro

PostBy: windyhill4.2 On: Sun Jun 15, 2014 5:33 pm

Drain the oil,install a new filter ,fill with Amsoil synthetic,if that doesn't make a difference, replace the pump.Generally pumps fail from scarring on critical surfaces rather than seal failures,but.... good luck on your so far good purchase. I reread, 3 qt.system took 2.5 qts to fill ?? Just figure on pump replacement,sorry.
windyhill4.2
 
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both

Re: Scag Hydro

PostBy: Lightning On: Sun Jun 15, 2014 7:40 pm

Oh wow.. Yeah I had one of those hydo transmissions apart on my JD L120 lawn tractor. Like windyhill said, they get scoring on critical surfaces and loose pressure. I replaced the pump and it worked good again for a couple years. But, I don't think I cleaned it good enough and the scoring occurred again. I ended up replacing the whole hydro transmission since everything else on the tractor is in decent condition still..

Replacing the little pumps inside the transmission was a pretty big job. I've never done such a thing, I only had YouTube vids to guide me. Was fun but wouldn't do it again. Kinda like roofing my house.. :lol:
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: Scag Hydro

PostBy: SMITTY On: Sun Jun 15, 2014 8:33 pm

I hate doing any kind of transmission work, mainly because it takes up all my valuable bench space ... of which there is hardly any to begin with. I need to spend a month organizing ... and with constant work coming in, that's NOT going to happen.

I've watched a few vids on Youtube on those hydro-trannies. Figured since I blew the head gaskets on that exact same Kohler engine, the tranny would be the next to take a *censored* on my '05 J/D G110. So far it still works, shockingly enough! :lol:

Hell of a score there Coalfire!! How many hours on her? I'd bet I could get $4 GRAND all day long for that thing around here. Nice job!! 8-)
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: Scag Hydro

PostBy: Coalfire On: Sun Jun 15, 2014 10:15 pm

SMITTY wrote:
Hell of a score there Coalfire!! How many hours on her? I'd bet I could get $4 GRAND all day long for that thing around here. Nice job!! 8-)



Not sure on hours meter is broke, I have been around enough equipment though to get a good idea. I think somewhere between 1000-1500, judging from the wear/lack of wear on the tires, mower wheels, deck and machine in general.

Ok so it sounds like pump replacement? But why would it be so strong forward?
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: Scag Hydro

PostBy: windyhill4.2 On: Mon Jun 16, 2014 5:52 pm

Depends where the damage occurred, &what was damaged. I've seen units that barely moved forward & had strong reverse & some exact opposite. You won't waste many $$ by changing the oil &filter,use a good quality oil,if that doesn't help,then.......... $$$$$$$$$$$$$$
windyhill4.2
 
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both

Re: Scag Hydro

PostBy: Rob R. On: Wed Jun 18, 2014 6:02 am

Check filters, reservoir, and any pickup screens for metal particles. See if you have a local hydraulic shop that can test/rebuild the pump.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Scag Hydro

PostBy: Coalfire On: Wed Jun 18, 2014 6:37 am

Rob R. wrote:Check filters, reservoir, and any pickup screens for metal particles. See if you have a local hydraulic shop that can test/rebuild the pump.


I pulled the hydro off, I can get a new one for $500 the hydraulic shop I talked to said they need to know the model number to know if they can work on it. I seen online you can get a seal kit, and internal parts. I might just rip it apart myself and see what I find :)




Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: Scag Hydro

PostBy: windyhill4.2 On: Wed Jun 18, 2014 6:57 am

A few yrs ago i had a cub cadet come in with no drive in one direction,can't remember which.The owner is a helicopter mechanic & had torn the pump apart & put it back together thinking the "lines" on the surfaces didn't matter.We tore the pump apart & found just very shallow scoring,installed a new pump & solved the problem.Scoring in a hydro doesn't have to be really bad to affect the performance.Just saying this to make you aware that even small,minute scratches do matter.
windyhill4.2
 
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both

Re: Scag Hydro

PostBy: SMITTY On: Wed Jun 18, 2014 11:14 pm

Coalfire wrote:Ok so it sounds like pump replacement? But why would it be so strong forward?

Most of those run on 20w-50, so an oil change would be cheap enough to try first - worth a shot anyway.
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: Scag Hydro

PostBy: titleist1 On: Thu Jun 19, 2014 7:08 am

SMITTY wrote:Most of those run on 20w-50, so an oil change would be cheap enough to try first - worth a shot anyway.


i had to do some web research on hydro fluid recently and rotella T6 5w-50 synthetic is what i ended up using in the hydrostatic on a cub cadet i am rehabbing.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Scag Hydro

PostBy: windyhill4.2 On: Thu Jun 19, 2014 7:30 am

Hydro-Gear recommends 10w40 engine oil in all their units. We had a Hustler dropped off here that the left side took quite a while to build enough pressure to drive,drained the tank,put a new filter on & refilled with Amsoil 10w40,problem solved.
windyhill4.2
 
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both

Re: Scag Hydro

PostBy: SMITTY On: Thu Jun 19, 2014 8:46 am

Hydro gear recommends 20w-50 in mine (ZT-3400)
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler