Yanmar 155D new owner intro / advice request

[bmaverick]

I'll echo Kenmac's statement too!

DO NOT use garden hose flushing for any vehicle's cooling system PERIOD. Regular tap water, even semi-filtered, has contaminates that will in time (months) cause galvanic corrosion internally to the system. Distilled water, RO water and even Berkey filtered water passes the needed requirements for the cooling system. I had spent nearly 15-years working for GM in the sciences of HVAC+engine-cooling technologies along with a few US patents over those years.

To do a flush, use distilled white vinegar 50% with 50% water as mentioned above. Run the tractor for 3-5mins on low idle. Drain, flush with 100% water mentioned above. Now add the good ol green stuff premix 50/50. If the first flushing is really dirty, redo the first step.

BTW, NEVER use DEXCOOL in anything. :2cents: That is another story and I can not go into those details. Look it up on the web, the evidence is all there.

 

[clemsonfor]

Aw Aaron (Hoye) got real complicated there. Here's what another dealer posted on here long ago and it has worked every time I've needed to bleed the system (don't ask )
I think its documented this way in the Operation Manual :

There are three bleed screws. Filter inlet, filter outlet, and the third is down on the injector pump.
Bleed the uppermost one (nearest the tank) until pure fuel comes out. Close it, do the same to the second one (fuel outlet side). Close that, bleed then close the lowest one.
It's that simple.

I've never had to bleed on the high pressure side of the pump. Cranking at full throttle (with compression released) will drive any air out of those lines.

Never had to crack injector lines for filter change. You might if you run it dry out of fuel, but just do those 3 screws , on filter housing and injector pump and your good to go, starts right up wont miss a beat.

 

[graysonh]

Ya know Winston, I was changing the oil last night and I thought "why would a 48" mower have model number '42'?" So I did the old one-redwing-equals-one-foot test and it is indeed a 42" mower. Oh well. i am going to finish the fluid / filter service, get it working on the 770 pto setting (which in some places is referred to as 800?) and see if it still requires sharpening. Haven't run it at the faster setting yet.

And thanks all -- I will NOT use a garden hose! Initially I just wanted to use one while cold in order to blast out whatever rusty bits I could. But I'll just do a more traditional flush with distilled water. The system takes only a gallon, so 98 cents per flush is A-okay with me. Add vinegar and we may be up to a couple bucks. Considering I put a gallon of new oil in last night for an engine that (who knew?) only takes around 2.5L, the $.98 will barely register on the list of silly expenses

Note to any future 155D / 2 cyl yanmar owners: your tractor uses less oil than you can believe!

 

[clemsonfor]

Ya know Winston, I was changing the oil last night and I thought "why would a 48" mower have model number '42'?" So I did the old one-redwing-equals-one-foot test and it is indeed a 42" mower. Oh well. i am going to finish the fluid / filter service, get it working on the 770 pto setting (which in some places is referred to as 800?) and see if it still requires sharpening. Haven't run it at the faster setting yet.

And thanks all -- I will NOT use a garden hose! Initially I just wanted to use one while cold in order to blast out whatever rusty bits I could. But I'll just do a more traditional flush with distilled water. The system takes only a gallon, so 98 cents per flush is A-okay with me. Add vinegar and we may be up to a couple bucks. Considering I put a gallon of new oil in last night for an engine that (who knew?) only takes around 2.5L, the $.98 will barely register on the list of silly expenses

Note to any future 155D / 2 cyl yanmar owners: your tractor uses less oil than you can believe!

Sorry if I am partly to blame for the over 1 quart of excess oil you put in:ashamed: I too would of thought it took 4 ???


Also Winston was also suggestion looking for a suffix to the model of that mower. They were made in 2 different rotations, and if you have the wrong one you could be turning the blade in reverse so no matter how sharp that blade is it wont matter. An easy way to tell is go cut for 10 minutes and look to see what side of the blade is shiny, the back side or the sharpened end. Since you have already used this like you said you wont have to do any additional cutting most likely, the metal will already be polished up.

 

[graysonh]

After a little research I have another thought or two about your mower. Your mower picture shows it to be an RM42 which stands for 42" cut. The RM stands for rear mount. These mowers are classified as finish mowers. They have a single swinging blade like a rough cut rotary mower. They also have an over run clutch built in. Also seem to come in cw and ccw rotation. The on line parts manuals indicate different suffixes on the end of the RM42 such as YM-1, YM-2, KB-1, JD-1. I would believe that would indicate tractor manufacturer. Wondering if yours has one of these suffixes on it anywhere? Here is a good shot of the belt configuration. https://d323w7klwy72q3.cloudfront.net/i/a/2016/20161214ve/L4903F.JPG
.

Thanks Winston and Clemsonfor. I'm away from it right now, but I haven't noticed a suffix. It does have text saying something like "For Kubota xxx (can't remember) use 800 | For Yanmar 135 and 155 use 800| For (can't remember) use 540 | All others use 540"

What I'm not sure I understand is, would it be a CCW mower for a CW PTO? Is that some sort of feature? If so, not the end of the world I guess, I could just sharpen the opposite side? Or, if it is CCW, is it meant for a CCW PTO? If so that is quite a bummer!

 

[California]

DO NOT use garden hose flushing for any vehicle's cooling system PERIOD. Regular tap water, even semi-filtered, has contaminates that will in time (months) cause galvanic corrosion internally to the system. Distilled water, RO water and even Berkey filtered water passes the needed requirements for the cooling system. I had spent nearly 15-years working for GM in the sciences of HVAC+engine-cooling technologies along with a few US patents over those years.

To do a flush, use distilled white vinegar 50% with 50% water as mentioned above. Run the tractor for 3-5mins on low idle. Drain, flush with 100% water mentioned above. Now add the good ol green stuff premix 50/50. If the first flushing is really dirty, redo the first step.

BTW, NEVER use DEXCOOL in anything. :2cents: That is another story and I can not go into those details. Look it up on the web, the evidence is all there.

Excellent advice, I never knew that. Tapwater at the orchard is so acidic that coffee will turn your stomach, we don't use it for cooking. (and there's no water softener etc). I'll use a distilled water flush, or two, the next time I change coolant.

Thanks!

 

[California]

Considering I put a gallon of new oil in last night for an engine that (who knew?) only takes around 2.5L ...Note to any future 155D / 2 cyl yanmar owners: your tractor uses less oil than you can believe!

I hope you drained off the excess!

 

[winston1]

Although there are cw and ccw models I would rest easy thinking it is correct for your 155 if it came with it. Blade tip speed is important to get a good cut.

 

[careyo63]

I use a Woods FM made for JD. It has regular mower type blades. I use straight cut blades and not the High Lift that wear out quick. I run 2nd. gear PTO. @ about 1700eng. RPM. Love it!! I sharpen them every year and had the straight cut for over 3 yrs. The high lift lasted about 2 Tops.

 

[clemsonfor]

Thanks Winston and Clemsonfor. I'm away from it right now, but I haven't noticed a suffix. It does have text saying something like "For Kubota xxx (can't remember) use 800 | For Yanmar 135 and 155 use 800| For (can't remember) use 540 | All others use 540"

What I'm not sure I understand is, would it be a CCW mower for a CW PTO? Is that some sort of feature? If so, not the end of the world I guess, I could just sharpen the opposite side? Or, if it is CCW, is it meant for a CCW PTO? If so that is quite a bummer!

you could sharpen the other side, I thought about that, but usually the blade profile wont quite work right the other way unless it has flat blades and then there still usually shaped for one direction.