Hydraulic Suction line - where did the fluid all go - oh no!

[bmaverick]

Here's a blunder not to get stuck doing. Last fall, I changed the hydraulic fluid. I'm good for a few years, so I thought.

On the throttle side of the YM2610, under the floor foot rest is the suction line for the hydraulics. At the location where the tractor can be split for clutch access, it's joined be a 6-inch hose and 2 clamps. The hose somehow got bunched up and ruptured. A small weeping leak began. When did this all start, I have no idea. I seldom crawl under the machine unless I grease the fittings. I check the fittings come Spring, July 4th weekend and Fall. Upon my recent inspection, the jumper hose was in shreds.

Needless to say, buying any JDM J20C fluid is now very pricey. $30 for a mere 2 gallons.

Here are some tractor **** shots of my girl underneath. Careful she is shy and will be embarrassed if she knew this went out. LOL

The new hose, It's a drain hose segment I had from the washer machine. Fits like a glove. Oh boy!

It says it 'meets' JDM J20C. Here's the good proof.

 

[ponytug]

Sorry to hear about your leak.

Just for the future, not many dishwasher hoses carry ratings for exposure to oil. These probably have more longevity;

Return & Suction Hose | Hydraulic Hose and Hose Assemblies | Hydraulics | www.surpluscenter.com

Return & Suction Hose,Hydraulic Hose and Hose Assemblies,Hydraulics, 12C4 3/4&quot HYD SUCTION/RETURN LINE HOSE Brand new. Two-wire braided,

www.surpluscenter.com

All the best,

Peter

 

[bmaverick]

Sorry to hear about your leak.

Just for the future, not many dishwasher hoses carry ratings for exposure to oil. These probably have more longevity;

Return & Suction Hose | Hydraulic Hose and Hose Assemblies | Hydraulics | www.surpluscenter.com

Return & Suction Hose,Hydraulic Hose and Hose Assemblies,Hydraulics, 12C4 3/4&quot HYD SUCTION/RETURN LINE HOSE Brand new. Two-wire braided,

www.surpluscenter.com

All the best,

Peter

The hose is from the clothes wash machine. The clamps are from automotive.

The hose is braided too. All should be good. I'll keep monitoring as I'm not wanting to buy fluid again.

 

[oldnslo]

I would suggest keeping a very close eye on that hose since like ponytug, I suspect oil may attack it and make it soft and mushy. Could also collapse under vacuum cavitating your pump.

 

[bmaverick]

I would suggest keeping a very close eye on that hose since like ponytug, I suspect oil may attack it and make it soft and mushy. Could also collapse under vacuum cavitating your pump.

I closed the gap between both pipes. There is an adjustment about 8 inches forward under the fuel filter bowl. The old gap was 1/2 inch. I have it nearly together about 1/8 now.

 

[ponytug]

@bmaverick: I wasn't worried about the hose needing reinforcement, so much as inexpensive rubber tends to degrade in contact with hydrocarbons, like oil; I was worried about the hose going mushy(as @oldnslo pointed out), just dissolving into your nice clean hydraulic fluid, and finally chunks of hose getting sucked in at some point leaving you with a hole again.

All the best,

Peter

 

[stsid1]

Don't use automotive grade coolant hoses either. They will swell up when exposed to oil.

 

[rScotty]

@bmaverick: I wasn't worried about the hose needing reinforcement, so much as inexpensive rubber tends to degrade in contact with hydrocarbons, like oil; I was worried about the hose going mushy(as @oldnslo pointed out), just dissolving into your nice clean hydraulic fluid, and finally chunks of hose getting sucked in at some point leaving you with a hole again.

All the best,

Peter

I've seen that too. In fact, I've had it happen on my own Yanmar. It always surprises me when a hose that looks perfectly good turns all mushy. And then some section of garden hose turns around and lasts for decades. I don't know what materials are compatible with which fluids anymore. But I've seen mushy.

It's common for even a good quality suction hose to form longitudinal splits at the ends as they age. The splits are usually under the hose clamp area. These cracks are pretty much invisible when looking at the hose, because at the end of the hose the split just shows as a pinhole. And the ends aren't perfect when hoses are cut to length anyway.

The best evidence for old hose internal cracking on the ends is hydaulic fluid on the outside of the hose but no clear reason why it got theres. With no obvious hose damage or wear.

Worm drive and similar screw-adjustable hose clamps aren't as good as the types of clamp that maintain their spring pressure as the hose compresses.

rScotty

 

[bmaverick]

I've seen that too. In fact, I've had it happen on my own Yanmar. It always surprises me when a hose that looks perfectly good turns all mushy. And then some section of garden hose turns around and lasts for decades. I don't know what materials are compatible with which fluids anymore. But I've seen mushy.

rScotty

I look mainly for neoprene. It's excellent for oils and hydraulic fluids. A cheaper alternative is Buna-N that 'could' survive under most applications as a gasket or o-ring. Yet it's not all that great in sunlight. Thus, neoprene is the winner.