• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Recent content by pfpm

  1. P

    Hitachi EX 300-3 Hydraulic problem

    When cold some pumps get valve plate to slider separation which is why your track stops completely. Some only do it when hot. The vibration you can feel when hot is the same thing only at a higher frequency. When these machines first started showing these symptoms Hitachi would replace the...
  2. P

    Hyd problum with rear boom

    Can you move the spool when the engine is turned off?? If not have you over tightened the through bolts?
  3. P

    Hitachi 200-3 pump goes to full stroke

    You can put a multi meter on the output from the PVC and compare the resistance with the good output to see what you get. Should have no resistance when switched. Maybe you have a cold solder inside the PVC?? which is causing a bad earth. regards Mike
  4. P

    Hitachi 200-3 pump goes to full stroke

    The two wires going to the pvc are separate earths for each solenoid. Are you saying that when you earth one of these wires (111/103) at the pvc the solenoid destrokes the pump? The pcv switches to earth the coil. Sorry forgot, If the DR is saying that the solenoid is energized I think that it...
  5. P

    Hitachi 200-3 pump goes to full stroke

    The wire numbers are from the solenoid to the pvc, They are from a dash 2 model so i hope the dash3 is the same number you may have to check. Yes you have 24v coming from the pump control relay all the time. The solenoid is in series between the pump control relay and the 111,103 wires in the...
  6. P

    Hitachi 200-3 pump goes to full stroke

    Try running a separate 24v wire to the solenoid and separate ground. They are 24v coils so I doubt that 12v would be enough to power it. Yes 22v should work but you say you loose the voltage when you plug it into the solenoid. If the pump destrokes ok with a separate power supply you can look...
  7. P

    Hitachi 200-3 pump goes to full stroke

    Just to clarify a few things. The solenoids should have 24+ volts to each one all the time, When they switch they are earthed out in the computer. Now when the pump is at full stroke does the DR say that the destroke solenoid is active? When you say that you can destroke the pump using a...
  8. P

    ex100.2 bucket cylinder weak & slooooooowwww

    Be very careful with these valves. The solenoid does not do anything under single operation of a function. Not sure the exact sequence but it is something like when you move two spools the lower pressure one will close off a bit and also when you change dig functions it sends a different...
  9. P

    ex100.2 bucket cylinder weak & slooooooowwww

    Don't know about the ex 100 but on 120 to 220 ther are proportional valves on some spools. Thier function is to restrict the flow on one circuit so that other functions will work. If one was closed it would only allow a small amount of oil through. From memory they are either in front or behind...
  10. P

    Hitachi EX200-3 pump noise

    You can verify that the solenoids are causing the noise by disconnecting the wires. The pump will slowly come on stroke and load up the motor. I would still swap the solenoids around and see what happens( but not the wires) If you want some peace of mind you can pull the pump head off and have...
  11. P

    Hitachi EX200-3 pump noise

    The diagnose bit is easy, The clicking noise is the high speed solenoids on top of the pump firing. They become prevalent especially at idle when they fire to keep the pump at minimum stroke, you probably find that as the machine warms up they do it more often. I think that as the pump wears the...
  12. P

    Very old Hitachi UH061 Parts.

    Thanks for that I will give them a try Regards Mike
  13. P

    Very old Hitachi UH061 Parts.

    I have been chasing a pinion gear for the slew motor on a old Hitachi UH061. Haven't had any luck in Australia and that part has been discontinued by Hitachi. The genuine part number is 3015515. Does anybody have any clue as to where one might find something like that in the US. Other wise I...
  14. P

    Hitachi EX200-2 Problems

    The pin you are talking about should not come into the equation, It is there to allow you to move the excavator in case of a total electrical failure. You probably know that it fits into a hole in the servo piston and if you remove the cover and turn it it will interfere with the piston and stop...
  15. P

    Hitachi EX200-2 Problems

    Hi Aaron. Sounds like you have what Hitachi call a pump mecha-regulator. I have fitted a few of these in Australia over the years and from memory the regulator that sits on top of the pump head has shims on the internal spool. you add to increase absorption torque and in your case you remove...
Top