Discussion:
P/S coupling

I have a Cat F30, 5DB2168. It's taking out the coupling out on the back of the steer motor at full lock. The orbitrol and pump have been replaced. It's Ok, until you get to the full lock.
  • Posted 14 Oct 2014 10:10
  • Modified 17 Oct 2014 04:52 by poster
  • By rjjburns
  • joined 1 Jul'11 - 14 messages
  • Michigan, United States
Showing items 1 - 5 of 5 results.
on the new style the pressure relief may be built in or could be it is relying on the orbital valve to have a pressure relief.
are you sure the old style is no longer available? tvh maybe?

if you're not getting any relief when steering goes to stall point then it will break that coupling every time.
  • Posted 30 Oct 2014 01:51
  • Modified 30 Oct 2014 01:51 by poster
  • By swoop223
  • joined 23 Mar'12 - 3,692 messages
  • North Carolina, United States
You've been swooped!
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The coupling is plastic, on the old style pump (Rexroth) there was a pressure relief, on the new style (Casappa) there aren't any signs of a pressure relief.
  • Posted 30 Oct 2014 00:32
  • By rjjburns
  • joined 1 Jul'11 - 14 messages
  • Michigan, United States
well then i would double check the pressure relief valves and make sure the system is not set too high causing it to lock up. It may be exerting too much stress on the coupling causing it to break.

One other thing important to remember is to lube the coupling if it is all metal when installing, if there are any rubber parts then do not use regular grease, i would use lithium. If you are installing it dry that may be causing premature wear weakening it.
  • Posted 21 Oct 2014 01:07
  • By swoop223
  • joined 23 Mar'12 - 3,692 messages
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Thanks for the reply. Both parts I've replaced are from my local Cat dealer.
  • Posted 20 Oct 2014 22:19
  • By rjjburns
  • joined 1 Jul'11 - 14 messages
  • Michigan, United States
2 things
if you are using aftermarket parts....dont...
use OEM parts

second is check the relief pressure and make sure it is not too high
steering should go into relief at the stop, you may have an orbital valve problem too.
relief pressure should be approximately 1161psi
  • Posted 18 Oct 2014 17:12
  • By swoop223
  • joined 23 Mar'12 - 3,692 messages
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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