No HP pump on Laser 4000 undercarriage??

[Harper220]

Hello- The high pressure pump on my Laser 4000 will not kick on when undercarriage is triggered. The Lex air valves are changing over and I can manually kick on the hp pump in test mode. What should I check or look for?

Also, sometimes when the Lex air valves change over it sounds sloppy like water is interfearing. I put a rebuild kit in both, so what might be going on there as well?

Thanks in advance!

 

[Harper220]

Follow up...the hp pump was kicking on after all, it was the mac valve that wasn't releasing the U/C Lexair valve all the way...strange???

Took Mac valve apart, tinkered with it and problem solved hopefully!

 

[whitescout]

The mac valve will stick if it is not fed with clean dry air. If it starts to stick, I usually push in on the white button on the side to manually operate it 5-6 times to see if this helps. If not, Itake it apart, and clean it, and then add some graphite to help keep it from sticking.