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scubadave

Intermittent air pressure alarm **UPDATE**

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99 Volvo VNL610 with Cummins N14. Drove about 150 miles this morning and all of a sudden the alarm sounds, no red triangle and no red lights on the air pressure gauges. Pressure reading on both gauges about 105 psi. Alarm sounded for a couple minutes then stopped, air pressure increase towards the end of the alarm. Again about 15 minutes later the alarm came on again but lasted for less than 5 seconds, this time pressure reading about 115. Thus happened a total of about 5 times then nothing further. Drove an additional 30 miles until stopping and everything OK. Any idea what may be causing this?

Edited by scubadave

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My rig did the same thing 2 weeks ago.  It's a 1997 Volvo WIA 64.  Had my mechanic check it out....he changed out my pressure relief valve.  Left the next day from Snow Hill NC.......im now in Fresno CA.  Everything works fine.  The pressure relief valve was 300 bucks and 91 bucks for install.

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19 hours ago, Alie&Jim's Carrilite said:

Replace the governor.  It's a 5 minute job at a park, or a 10 minute job on the side of the road dodging traffic.

X2.

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Please explain the governor comments. The gauges were showing above 100 psi, and the alarm shouldn't come on until the system pressure falls to roughly 60 psi. This sounds more like a pressure switch/sensor or wiring issue than a governor issue.

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26 minutes ago, Darryl&Rita said:

Please explain the governor comments. The gauges were showing above 100 psi, and the alarm shouldn't come on until the system pressure falls to roughly 60 psi. This sounds more like a pressure switch/sensor or wiring issue than a governor issue.

do they warn also of over pressure?

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After about 1300 miles after a new governor the alarm sounded twice for about 2 seconds. Today the compressor would cycle about every 9 minutes, much better than the 2 minutes before the governor change. 

Since the mechanic mentioned a filter in the air dryer, is their such a thing and if so, where might it be located on a 99 VNL610?

Dave

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49 minutes ago, scubadave said:

After about 1300 miles after a new governor the alarm sounded twice for about 2 seconds. Today the compressor would cycle about every 9 minutes, much better than the 2 minutes before the governor change. 

Since the mechanic mentioned a filter in the air dryer, is their such a thing and if so, where might it be located on a 99 VNL610?

Dave

On the inside of the drivers frame rail underneath.  About at the location of the drivers side fuel fill door.

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6 hours ago, scubadave said:

After about 1300 miles after a new governor the alarm sounded twice for about 2 seconds. Today the compressor would cycle about every 9 minutes, much better than the 2 minutes before the governor change. 

Since the mechanic mentioned a filter in the air dryer, is their such a thing and if so, where might it be located on a 99 VNL610?

Dave

You've got a leak somewhere, if your compressor is cycling that fast. The vent on the dryer may be an issue, but there's a leak somewhere. And, you've still got an issue wwith the alarm.

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Scroll down on the Heavy Hauler Resource Guide to find the wiring diagrams specific to your truck. Some of them are integrated to the gauges, others have dedicated switches under the dash. There will be more than one sensor, one for the primary tank, and one for the secondary. They both trigger the same alarm, so you need to check both systems.

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On 11/2/2019 at 10:51 AM, Flying Finn said:

You may want to check brake  chambers.  The "pancake" rubber baffle inside the rear chamber was old and started leaking.

$3.74 @ Napa in Florida.  Bought one of the pancakes to have on hand when traveling.  Made sure to tell the wife it's NOT a dog bowl.  

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