Couple Rookie questions

[djzander]

MX5100 HST 4wd

does hydraulic produce more pressure/power as engine rpm is increased?

If yes about what speed in max pressure achieved?

Medium duty use on a 2013 MX 4 cylinder , mowing/ a little bucket use , not excessive lifting.
brush hogging a little post hole digging, tilling. 6 acre plot where i use it.

what could I expect to get out of it hours wise / years wise. Whats a lot of hours?

3000 before rebuild/scrap or ?

Assuming its serviced per the recommended hours on oil etc, using Kubota filters etc.

 

[Dave_eng]

MX5100 HST 4wd

does hydraulic produce more pressure/power as engine rpm is increased?

If yes about what speed in max pressure achieved?

Medium duty use on a 2013 MX 4 cylinder , mowing/ a little bucket use , not excessive lifting.
brush hogging a little post hole digging, tilling. 6 acre plot where i use it.

what could I expect to get out of it hours wise / years wise. Whats a lot of hours?

3000 before rebuild/scrap or ?

Assuming its serviced per the recommended hours on oil etc, using Kubota filters etc.

The hydraulic flow volume increases with engine speed. Max pressure remains almost constant from low to high rpm.

6,000 hrs +

40 years or more. Stay off of salted roads and out of sun when not in use.

Dave

 

[SidecarFlip]

The hydraulic flow volume increases with engine speed. Max pressure remains almost constant from low to high rpm.

6,000 hrs +

40 years or more. Stay off of salted roads and out of sun when not in use.

Dave

With proper maintenance 6000 hours is very conservative. I'd expect at least 10,000 hours before the engine needs touched. Kubota engines are very durable. Having said the the worst enemy of a Kubota engine is excessive heat. Keep the radiator and screens clean at all times. I clean mine daily when I'm farming.

far as staying out of the sun, my cab M9 is Mary Kay pink now.

 

[troverman]

With proper maintenance 6000 hours is very conservative. I'd expect at least 10,000 hours before the engine needs touched. Kubota engines are very durable. Having said the the worst enemy of a Kubota engine is excessive heat. Keep the radiator and screens clean at all times. I clean mine daily when I'm farming.

far as staying out of the sun, my cab M9 is Mary Kay pink now.

I agree. The engine itself could run to 20,000 hours. These are iron block / iron head tractors, with two valves per cylinder. The camshaft, injection pump, and oil pump are operated by geared drive, not chain / belt or some combination. They have a very large engine oil capacity relative to displacement. Newer tractors that are equipped with a DPF could have a shorter life, since each regeneration allows a certain amount of crankcase oil dilution with fuel. Obviously, proper maintenance including oil and filter changes, are critical to long life. Operating at higher RPMs will also prolong the life.

Your MX5100 does not have a DPF which is beneficial; however it does use EGR which is not beneficial, but still likely better than the DPF when it comes to ultimate engine longevity.

 

[djzander]

operating at higher rpm prolongs longevity??

please explain

 

[troverman]

operating at higher rpm prolongs longevity??

please explain

On DPF tractors, high RPM means higher exhaust temps, which means more passive regens and less active regens. The fewer active regens you have the better in terms of less fuel dilution (and subsequent wear). Plus, your DPF lasts longer.

For all tractors, more RPM eliminates the possibility of cylinder wet stacking, where not all the fuel burns completely and washes the cylinder walls, causing early wear. Keeping the engine oil up to temp helps.

 

[SidecarFlip]

Good explaination, especially with Tier 4 compliant engines. Glad that isn't a concern with my units. I rarely run them at rated RPM. No need, plenty of PTO horsepower.

Seems to me that I read somewhere that the DPF filter life is 2500 regens and then it's replacement time and I'm sure the ECM will tell you that.

Don't see many owners getting to 2500 regens unless it's an ag tractor or a job tractor that gets used day in and day out.

 

[troverman]

I think it's closer to 250 active regen cycles. Mine does a burn about every 35 hours...that'd be over 8700 hours on the tractor before needing a new DPF. Few are putting that many hours on them, especially these smaller tractors.

Lucky you for not having the emissions equipment.