My buddy has a 7040 with about 200 hrs on it. He just had to have the hyd pump replaced. The mech told him those pumps have steel gears with a aluminum housing. He is going to sell it and I was just wondering if any one else was having same problems or is all the pumps built that way. Sounds like if the filter misses any metal particles, that alum housing is in trouble.
7040 hyd pump question
- Thread starter DThrash
- Start date
My '11 M7040 has 1245 hrs on speed/hr meter with no hyd pump problems. Both hyd filters have a magnet inside them to hopefully catch metal filings before they reach the pump
Correct. The pump is made of an aluminum housing and side plates, with steel gears. Many (most) tractors are designed this way, and are problem free with that design in itself. What usually hurts pumps is (1) heat and (2) contamination of the oil.
Hydraulic oil does 2 things (and then some) to the pump. It lubricates it and cools it. Cool oil going into the pump helps it live. Good clean oil (UDT or preferably super UDT2) keeps it lubricated.
Generally speaking, pumps should not be replaced without flow testing before AND after. And that means inspecting the supply pipes and filters for dents, suction leaks, screens, etc. When the pump is trying to "suck" aerated oil, it gets hotter than normal. Also, contaminated oil causes problems. Water (moisture) doesn't lubricate very well. Some cheap hydraulic oils have a tendency to develop algae in the oil, which causes filters to become restricted, thus causing wear on the pump. I have NEVER seen this happen with UDT or Super UDT (JD Hy-gard and the TSC oils are a totally different story...). Then if a loader valve or 3 point position control or other implement is not adjusted proper, and the system is constantly making maximum pressure (against the relief valve), the oil will overheat quickly and destroy the pump in no time. Like the time when a customer of mine had his M5040 running a hydraulic log splitter, closed center...when he wasn't using the splitter the tractor was making 2500 psi hydraulic pressure. Took less than 50 hours to destroy the hydraulic pump.
Hydraulic oil does 2 things (and then some) to the pump. It lubricates it and cools it. Cool oil going into the pump helps it live. Good clean oil (UDT or preferably super UDT2) keeps it lubricated.
Generally speaking, pumps should not be replaced without flow testing before AND after. And that means inspecting the supply pipes and filters for dents, suction leaks, screens, etc. When the pump is trying to "suck" aerated oil, it gets hotter than normal. Also, contaminated oil causes problems. Water (moisture) doesn't lubricate very well. Some cheap hydraulic oils have a tendency to develop algae in the oil, which causes filters to become restricted, thus causing wear on the pump. I have NEVER seen this happen with UDT or Super UDT (JD Hy-gard and the TSC oils are a totally different story...). Then if a loader valve or 3 point position control or other implement is not adjusted proper, and the system is constantly making maximum pressure (against the relief valve), the oil will overheat quickly and destroy the pump in no time. Like the time when a customer of mine had his M5040 running a hydraulic log splitter, closed center...when he wasn't using the splitter the tractor was making 2500 psi hydraulic pressure. Took less than 50 hours to destroy the hydraulic pump.
I've been using JD Hy-gard since the late 80's & was employed by a JD dealer from mid 60's to late 80's and have never witnessed any problems with Hy-gard except the PRICE. Algae requires moisture and any oil I've been around can get contaminated with moisture. I'll bet my M7040 hyd system with UDT can get contaminated with H2O but whether algae will grow is another subject.
Are you stating UDT & Super UDT have an additive of biocide to limit the growth of algae???
Our old L3750 is in need of a new hydraulic pump, but it has well over 3000 hrs on it and was severely neglected for many years. I think the aluminum housing/steel gears have held up well for the circumstances...
He does have a log splitter, I am not familiar with that set up, but I will talk to him about that before I make a decision one way or another.