m5030 hydraulics

hebren · Jan 8, 2015

All hydraulics including power steering stooped working at the same time after hearing small pop any ideas,

rbargeron · Jan 8, 2015

The M5030's hydraulic pump has two chambers - one for power steering and one for the other hydraulics. In the parts diagram the two chambers look to have separate suction pipes and oil sources so if both functions have stopped there might be something broken in the pump drive. There were different setups for M5030SU, M5030DT etc. - need to nail down the model and options to be sure what's there. Dick B

hebren · Jan 10, 2015

Had time to remove hydraulic pumps today,shaft is into, replace pump or try to repair,any suggestions

MHarryE · Jan 10, 2015

hebren said:
Had time to remove hydraulic pumps today,shaft is into, replace pump or try to repair,any suggestions

I assume you mean the shaft was broken, and broken somewhere around the shaft seal. One thing you should determine is why it broke. Snapping a shaft is unusual. Is it possible a relief stuck? By disassembling the pump you can examine the internals. The internal pump gears digging into the metal pump housing can snap the shaft. Some gear wear into the housing is normal. High efficiency gear pumps are built with very little clearance between the gear teeth and the housing. When the pump is broke in it is brought up to maximum rated pressure slowly and in steps so the gears can cut their own path in the housing (we call this "tracking"). A sudden pressure spike will result in an abrupt cut into the housing.

Repairing a failed pump always results in some loss of efficiency because the sections cannot be bolted together in exactly the same alignment as it had when originally assembled. The gears will cut a new track which results in more internal leakage than when first assembled. Cost can be the deciding factor. A pump is relatively easy to disassemble and reassemble.

rbargeron · Jan 11, 2015

From the factory parts diagram, it looks like they don't offer internal repair parts for the pump. There are 2 different pumps listed for M5030 and M5030SU tractor models - need to know which tractor you have. The M5030 uses pump 32530-76102 (around $1k) which includes both front and back chambers. They list a front-chamber-only for this type 32530-91620 (costs $300 less but need to be sure the back chamber of yours is ok - turns freely, no damage etc.) If your tractor is the M5030SU the pump listed is 35430-82202 (also around $1k) this one is both chambers and they don't list a front-only option. Sorry about the rotten news.

hebren · Jan 11, 2015

Thanks for the info,mine is M5030SUMDT great tractor. The reason for shaft failure is my fault, had float valve plumbed into hydraulic line for post driver and hit knob to shift between connection and one was dead ended,could hear pop and then no hydraulics.Sometimes you do things you cannot believe you did.This is 1995 model with just 2000 hours, heavy built tractor but not stupid proof.

big bubba · Jan 12, 2015

hebren said:
Thanks for the info,mine is M5030SUMDT great tractor. The reason for shaft failure is my fault, had float valve plumbed into hydraulic line for post driver and hit knob to shift between connection and one was dead ended,could hear pop and then no hydraulics.Sometimes you do things you cannot believe you did.This is 1995 model with just 2000 hours, heavy built tractor but not stupid proof.

hey at least you are honest about the mistake. it will make the repair that much easier. best of luck :thumbsup:

rbargeron · Jan 12, 2015

hebren said:
Thanks for the info,mine is M5030SUMDT great tractor. The reason for shaft failure is my fault, had float valve plumbed into hydraulic line for post driver and hit knob to shift between connection and one was dead ended,could hear pop and then no hydraulics.Sometimes you do things you cannot believe you did.This is 1995 model with just 2000 hours, heavy built tractor but not stupid proof.

I blew up a Cessna pump on an International 3414 backhoe that way - plumbed in a splitter on the wrong side of the relief valve - extruded the seals out around the shaft. They say if you never make a mistake you're not doing anything either.

When I was searching the part number for the SU 35430-82202 I saw an old classified listing on JLA forums from 2012 offering a new one of these pumps for $700 -

"4/12/12....price reduced! Brand new KUBOTA part number 35430-82202 hydraulic pump. This pump is $1020 from Kubota dealers so here's your chance to save some money. Replaces and will substitute for 35430-82200 and 35430-82203. Fits the following models: L3350, L3750, L4150, M4030SU, M5030SU....may fit others. Cash only. Due to scams, I WILL NOT RESPOND TO TEXTS OR EMAILS.....if you're seriously interested, call me at 903-880-8658"

No more info. it sounds like a private seller in East Texas - no idea if it's real or still available but might be worth a call.... maybe they'd send you some pictures of it ?