Cat D8H hyd pump whining, no power

[Jason merrick]

The noise does get worse when warm; I ordered a pump for starters

 

[Old Magnet]

Wrong priority. Hydraulic system problem should have been properly diagnosed before taking the system apart.

Yes, looks like some knuckle dragger miss stamped the blade on the assembly line.
Keep that in mind when it comes time to replace cutting edges/parts. Otherwise the hydraulic system doesn't care.

 

[mikebramel]

Cat Classic is probably Asian like most aftermarket pumps. Asian cartridges are $150-300 each. If the suction assembly is not air tight you will cavitate the new pump and be at the same spot. The vanes bounce on and off the cam ring.

 

[mikebramel]

Hook up to the test port on the outlet of the pump, point in bucket, is it straight oil, aerated or foaming?

 

[Jason merrick]

Old Magnet, where is the engine oil pan drain plug(s) located? My helper attempted to tell me that none exist. Is this possible?

 

[Jason merrick]

He dropped the 51" long belly pan and he says there isn't one; I didn't try to question him; I did not look for myself

 

[Nige]

It's not underneath which is probably where he looked. It's on the RH side of the oil pan (circled).

 

[lantraxco]

Should be a valve on the side of the oil pan near the bottom, no? Will have a hex head, it's like a long plug. Or a plug, Nige beat me to it, lol

 

[Jason merrick]

Do you have to drop or the pan whole, or in part, to access it,?there is a hinge on the rt hand side of the tractor.

 

[Nige]

Without being able to look at it, if there is a hinged panel on the RH side of the lower engine guard then no guarantees but the drain plug/valve ought to be behind it.

 

[Jason merrick]

Thanks, Nige

 

[Jason merrick]

Found it. The drain is incorporated into the lower part of the dipstick casting. 9/16" socket removes it; need not thread all the way out; it is a drain valve

 

[Jason merrick]

Mike, I'll try your bucket test as soon as I can. Gotta get the cylinder sealed and installed tomorrow.

 

[nicky 68a]

Jason ,those H series have two different drain plugs.Yours is the later style which is accessed without removing that giant belly plate.Whilst it's off,check the head as they often get worn causing some fitters not to get it tight.A new plug is cheap insurance if it's ragged.
The older style was right at the underside of the engine and was a big plug with 3/4 inch drive to move it.

 

[Jason merrick]

Jason ,those H series have two different drain plugs.Yours is the later style which is accessed without removing that giant belly plate.Whilst it's off,check the head as they often get worn causing some fitters not to get it tight.A new plug is cheap insurance if it's ragged.
The older style was right at the underside of the engine and was a big plug with 3/4 inch drive to move it.

Hey guys, the new pump fixed the problem!!!!! Running strong once again!!!!

 

[Jason merrick]

New hyd pump made the tractor happy again! Thanks for everyone's interest and helpful commentary

 

[Nige]

How about some photos of the innards of the old pump..? I'll pretty well guarantee the inside of the cartidges looks like a ploughed field.

 

[Jason merrick]

And the 2 1/2" steel, 2-piece suction line clamps were changed also (ref pic submitted by Nige). Well, actually, just the inexpensive rubber seals. There was nothing that indicated a suction leak upon disassembly and cleanup, other than an old silver-solder job of the large flange end-2 1/2" tube end that mates to the underside of the hyd pump. The job was completed in less than 5 hours. Sorry, hands were too filthy for pics on disassembly.

 

[Jason merrick]

I'll get that done, Nige