Re: Hydraulic Pump Replacement or Repair Reply #25 – October 11, 2015, 08:07:43 pm Pocket change, I understand were you are coming from with your suggestion, but I have learned that things do run smoother with Syn' oils and as I do the change myself etc the cost of the oil is not a killer so just for the heck of it I will do the change over regardless of any "state of oil" analysis. Even if it does not make any "world changing difference" it will not hurt.JohnH Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #26 – October 11, 2015, 08:14:20 pm back in the "old" days we used to spray chrome on the shafts then regrind them. That was for the big Diesel engines built by Napier in England. Did it on many parts as they were too expensive to throw.I personnaly did not do the work just the grinding.JohnHshould have said chromium (if I remember right. Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #27 – October 11, 2015, 08:24:17 pm another option is to machine a wear sleeve to go on the shaft it may require some shaft machining as well but truck wheel seals used a sleeve that on the spindle. It would take a lot of measuring and a really sharp dedicated person to measure and search out a seal. Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #28 – October 11, 2015, 08:45:58 pm Still new to our coach I have been noticing all the air and hyd lines,some of you probably know this but the ones with the non-compression fittings can be rebuilt easily,could probably re-use the fittings and have some bulk hose for emergency use.Good source for hose and fittings would be hose of south texas in Corpus Christi. Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #29 – October 11, 2015, 08:46:55 pm Quote from: its toby – October 11, 2015, 08:24:17 pmIt would take a lot of measuring and a really sharp dedicated person to measure and search out a seal.And keep in mind, all the really sharp dedicated people these days charge at least $100 per hour, regardless of results! Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #30 – October 11, 2015, 09:19:25 pm On the subject of synthetic oils for the hydraulic pump, I followed a study of the synthetics versus normal oil several years ago. The study came to the conclusion, to which I adhere, that the synthetics and the normal oils did basically the same job and under normal use the added expense was not worth it. EXCEPT........for extreme cold ( Siberia perhaps?) and extreme heat (hell). The synthetics viscosity held up better than the normal oil.I do use synthetic in my Harley which is air cooled and does get really hot in traffic, but have not used it elsewhere. Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #31 – October 11, 2015, 10:06:33 pm Quote from: John44 – October 11, 2015, 10:39:15 amHas anyone tried using a synthetic oil in the hyd system yet? If you use the same oil weight etc.I don't think it would hurtI replaced the diesel oil in my hydraulic system with hydraulic oil. My reasoning is this is a hydraulic system and the hydraulic oil probably has better additives suited for that purpose! Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #32 – October 12, 2015, 12:55:42 pm Keep in mind, typical Hydraulic Systems in RV use are not a "heavy duty" application. These RV systems are on the small end of the scale. In fact, compared to the typical PS pump in an auto these pumps are not much larger in spite of the extra service they provide. A pump being rebuilt for use in a motor home is in most instances on the small end of the hydraulic pump family by design. They don't need to be any larger. Serviced correctly these pumps will perform their design function for a long time with or without the use of synthetic fluids if simply maintained. You will have to replace worn hydraulic line(s) more often than replacing seals, which has nothing to do with "rebuilding" the pump.The design of the application in most instances are less than properly thought out. Many of the issues stem from the pump assembly not being (properly) secured in the first place which results in issues with excessive vibration. Rectify this issue and a fair percentage of pump problems go away. pc Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #33 – October 12, 2015, 05:13:23 pm Quote from: pocketchange – October 12, 2015, 12:55:42 pmKeep in mind, typical Hydraulic Systems in RV use are not a "heavy duty" application. These RV systems are on the small end of the scale. In fact, compared to the typical PS pump in an auto these pumps are not much larger in spite of the extra service they provide. A pump being rebuilt for use in a motor home is in most instances on the small end of the hydraulic pump family by design. They don't need to be any larger. Serviced correctly these pumps will perform their design function for a long time with or without the use of synthetic fluids if simply maintained. You will have to replace worn hydraulic line(s) more often than replacing seals, which has nothing to do with "rebuilding" the pump.The design of the application in most instances are less than properly thought out. Many of the issues stem from the pump assembly not being (properly) secured in the first place which results in issues with excessive vibration. Rectify this issue and a fair percentage of pump problems go away. pcGreat Point, Thank You and I will add a bracket, Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #34 – October 12, 2015, 07:26:53 pm FYI, the bracket on later models, like my 1998, is really beefy. Almost 1/4 steel with 4 grade 8 bolts holding it to the engine. It doesn't move, I assure you. And my pump is slowly weeping...and one motor is weeping a bit more. Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #35 – October 13, 2015, 09:05:06 am Quote from: krush – October 12, 2015, 07:26:53 pmFYI, the bracket on later models, like my 1998, is really beefy. Almost 1/4 steel with 4 grade 8 bolts holding it to the engine. It doesn't move, I assure you. And my pump is slowly weeping...and one motor is weeping a bit more.How long has the pump been weeping oil? Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #36 – October 13, 2015, 09:15:15 am My 96 u270 has the heavier bracket,I wonder if the tensioner could be causing a problem,as the spring wears it seemsthat you see more of a jerking movement. Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #37 – October 13, 2015, 09:44:43 am Quote from: Modern Day Jipzee – October 13, 2015, 09:05:06 amHow long has the pump been weeping oil? I've had the RV just over a year. It was tiny bit damp when I bought it. It's just a little more damp now.The tensioner was bouncing, but it wasn't due to a worn tensioner. The drive pulley on the crank shaft was not mounted concentric. I had to loosen the bolts and center it up. Quote Selected
Re: Hydraulic Pump Replacement or Repair Reply #38 – October 13, 2015, 10:00:22 am Quote from: krush – October 13, 2015, 09:44:43 am The drive pulley on the crank shaft was not mounted concentric. I had to loosen the bolts and center it up.Yes, an easy thing to check with a straight edge with engine idling. I hold a piece of white chalk with the straight edge and slowly move toward the pulley. Let it mark the "most run-out". Stop the engine, remove the belt, loosen the pulley mounting bolts and slightly move the pulley.Repeat until minimal run-out.But tensioners do TWO things: Provide tension and dampening. Here is a good video by Gates Corp on that subject: http://www.youtube.com/watch?v=uTLV5IU_IMM Quote Selected 1 Likes
Topic: Hydraulic Pump Replacement or Repair