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Regular Contributor

Re: 3608 pressure switch keeps failing.

Had a new 459-2591 pressure switch not work right out of the box. Replaced it with another new switch. Sent faulty new switch back to CAT.
Trusted Contributor
Trusted Contributor

Re: 3608 pressure switch keeps failing.

This part number is the hydrax switch, which is a necessary component in the control system.  It is not the switch that Cat recommends removing from the system.  The new part number 459-2591 switch should not be failing; it has shown to be a stronger part than the former 140-9669.  And the other answer is correct.  Do not install a jumper instead of the switch for continuous operation.  Using a jumper should only be done during troubleshooting to determine if the switch is good or bad.

 

What is the hydrax pressure relief set to?  The hydrax pressure should be 225 psi and steady showing on the gauge.  If the needle is not steady, this could indicate a problem with the hydrax pump, causing pressure surges.  This could affect the hydrax pressure sensor.   

 

What is the condition of the hydrax oil; what color is it?  If it is dark and unclear instead of clear and clean looking, this could indicate that the hydrax pump seal is bad and leaking engine oil into the hydrax system.  This kind of contamination can cause hydrax system issues.

 

Best Regards,

Al Hunt

Contributor

Re: 3608 pressure switch keeps failing.

which pressure switch are we talking about?

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Regular Contributor

Re: 3608 pressure switch keeps failing.

Media # M0065964 is about updating the pressure switch from the 1409669 part# to a 4592591.
New switch is built to eliminate the problem you have.

You can also jump the 2 wires in the harness going to the pressure switch to bypass it as a way to verify the switch is your problem. Don't recommend leaving it bypassed.
New member

Re: 3608 pressure switch keeps failing.

I was told there is a document for removing this sensor. If anyone has any information it would be extremely helpful.
Sebd9904
New member

Re: 3608 pressure switch keeps failing.

Was there a new bulletin out about these ?
New member

3608 pressure switch keeps failing.

has anyone heard of this issue? It's been failing about twice a month and shutting the engine down