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  1. R

    Swing cylinder hydraulic oil

    Thanks for the replies!
  2. R

    Swing cylinder hydraulic oil

    yes gear box that has the dipstick
  3. R

    Swing cylinder hydraulic oil

    Cat 312 track hoe What kind of oil does the swing cylinder require? Thanks
  4. R

    Cat 312 Grey hydraulics slow

    James, I will try it in the next few days, thank you.
  5. R

    Cat 312 Grey hydraulics slow

    James S. Thank you for the diagrams, I do have the parts book but my question is what holds the screen in place on the pump inlet and better yet after removal of screen how do I re-install the screen as it is at the bottom of the tank. NIGE thank you for the service manual number, do know if...
  6. R

    Cat 312 Grey hydraulics slow

    Sorry I am looking for a downloadable service manual for Cat312A. Thanks.
  7. R

    Cat 312 Grey hydraulics slow

    I have acquired a parts manual and it shows an element in one portion of hyd tank. It doesn't appear to have any direct flow to it as it is suspended in the tank.The other portion of the tank has a screen on top of the main hyd pump inlet. My question is how is it attached as tank is 32" tall...
  8. R

    Cat 312 Grey hydraulics slow

    Thank you I have been told this machine is grey and I have Chinese/Japanese markings in several places most notably in the electronic "brain" box left rear door. Yes it is a 1993 model as far as I know. My monitor panel is somewhat different than in the video. Have changed the hyd filter but...
  9. R

    Cat 312 Grey hydraulics slow

  10. R

    Cat 312 Grey hydraulics slow

    Pressures were run and nominal but response time is slow indicating to me that the flow is not up to par. And not able to tell if pump or couple is the culprit
  11. R

    Cat 312 Grey hydraulics slow

    Are u talking about the main hyd filter that I have changed and cut the old filter and no metal flakes present? An A model is what? Model # is 312 and it is grey. Hours on are 11412hrs. s/n is 7DK02085 Thanks for your help!
  12. R

    Cat 312 Grey hydraulics slow

    Case drain volume? Help me here, please. Engine does not bog down.
  13. R

    Cat 312 Grey hydraulics slow

    Slow response time on all functions, noisy pump. Pump rattles and groans. Hyd filter is new, old one was cut apart for metal flakes but found none. Do not have high pressure test equipment readily available but were nominal on tested circuits. Everything seems to indicate bad pump but want to...
  14. R

    CAT 312 water in had reservoir

    Yes, it is in the entire system because the water got in the system while it was deep in the woods and hoe was moved to the shop.
  15. R

    CAT 312 water in had reservoir

    Thanks for all the replies. Tank cap was secure along with bolts on inspection plates and no visible cracks or breaks in tank. Fluid was extremely milky. Yes, a hot and wet climate is a problem but machine has not had water in fluid for 10 or so years, just this spring/summer. Will try the...
  16. R

    CAT 312 water in had reservoir

    We had a spring/summer with lots of rain. I park my machine with the boom cylinders vertical. A large amount of water was in the reservoir when servicing the machine. Are there any other entry points for water other than the boom cyls? The fill point on top is secure. I completely drained the...
  17. R

    Cat 312 gray no electricity to console

    All batt connections are good. Have power on most fuses but not all. No power to ignition switch or console. All electrical components "look" good as in no burnt wires or arcing seen. Thanks for the suggestions.
  18. R

    Cat 312 gray no electricity to console

    Machine had sat for a while and have a solar charger on the batts. Turned key on and started machine and ran thru the motions. Killed the machine and everything went dead, the console is dead and engine will not turn over. Batts are charged and master switch is on. Nuttin. Ideas?
  19. R

    bubbles in hydraulic reservoir sight glass

    Had heating problem and solved it with pressure washing radiator. Now have a steady stream of bubbles in hyd res. sight glass. Temps running normal on engine and hyd fluid. No detected leaks on suction side. Ideas are welcomed. CAT 312 grey machine
  20. R

    Cat 312 grey heating prob

    Great idea, will measure tomorrow. Thanks for the idea.
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