Have you tried just cleaning them? even though they are probably supposed to be "sealed", most of them are not. if you purchase a can of pressurized tuner cleaner, radio shack used to carry it. saturate the volume control while turning it. i usually wrap the unit with paper towels as to not get the rest of the board. i also usually put on my safety glasses. you will see why. i am usually surprised as this works well with 90 percent of them i do.
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You do not mention the type of Motorola radio so this answer will be general. You may have a problem with your volume potentiometer, Receive (Rx) sensitivity, or a speaker problem.
The volume pot on a 2-way radio is a common failure item, and will after repeated use possibly fail, or get dead spots. Try backing off your volume to 75% and see if it is louder at this setting. If so, you have a bad volume pot.
Rx sensitivity can be caused by various internal problems with the radio,and some models are more prone to this than others. Operating your radio at full volume most of the time can bring this issue to the forefront. (Tip: Try running your radios at 80-90% volume vs. full volume to alleviate this problem.) If this is your issue, your effected radios are in need of repair. Most repair facilities (including ours) can correct Rx sensitivity in most models during a repair.
Speaker problems: If you work in an environment where dirt, debris or metal shavings can get inside the speaker, your speaker may fail over time. Or if you run your radio at full volume the majority of the time it can cause your speaker to fail.
This could be one of a variety of problems:
1. Bad speaker
2. No receive
3. You are on an unprogrammed channel
4. You have a bad volume potentiometer (dead spot in the on/off/vol)
5. Another internal issue
Try going to monitor mode and see if you can hear the white noise typical of being on monitor. If not, you could have problem 1, 2 or 4.
Try adjusting the volume and see if the radio works at a different volume level. If so, you have a problem with the volume pot.
Possibly a bad volume/on/off volume potentiometer. Try using canned air around the volume/on/off knob to remove any debris down along the shaft. If this does not help, your unit may need repair. Do not use any chemicals, cleaners or solvents on the shaft, only use air.
Clean your internal battery contacts on the batteries and the radio with a pencil eraser to assure good connection. If you are using rechargeable batteries, try charging the batteries again.
Check valve you replaced has made proper contact in socket. Plug it in and out a few times to clean pins. Is inteference/crackling noise there when volume is turned down to minimum. This should tell you whether the problem lies before or after the volume control. A good clean can solve many faults. Servisol on pots works wonders.
I had the same problem with a number of the radios we have here. The trouble was the volume control pots had broken loose from the circuit boards. Some I was able to repair by resoldering and some needed new pots. We got parts from a local Motorola distributor.