Either low on refrigerant or a blocked capillary tube. Since you have attached a gauge I assume you have tried adding refrigerant so the next step is to replace the capillary tube and drier and weigh in the charge.
I am not 100% sure on your model but some of these units that went into large chain stores had reversible condenser fan motors that would reverse occasionally to blow the dirt accumulated back out of the condenser.
A T-49F is a freezer - a T-49 is a cooler and has no defrost timer or heater. If it's freezing up the thermostat needs to be checked. The coolers use a thermostat to check inside coil temperature and typically cycle off when the coil reaches somewhere around 15f and then cycles back on when the coil reaches around 40f. For this reason the box temperature when empty will make wild swings
A T-49F is a freezer - a T-49 is a cooler and has no defrost timer or heater. If it's freezing up the thermostat needs to be checked. The coolers use a thermostat to check inside coil temperature and typically cycle off when the coil reaches somewhere around 15f and then cycles back on when the coil reaches around 40f. For this reason the box temperature when empty will make wild swings.
Sounds like it may be cycling off hard due to high discharge pressure. Make sure the condenser under the unit is clean and the fan motor is running. It shouldn't be running 60f. A lot of people make the mistake of checking temperature with an empty unit. Put a couple of gallons of water in the unit so that the temperature evens out. These units do NOT run based on air temperature but rather on inside coil temperature. That will swing wildly with no load in the unit.
First the compressor fins must be perfectly clean to aid air flow through it. Put a cloth under it and spray with strong detergent from a bottle sprayer. Make sure you aren't spraying anything electrical! True is a good make, I have lots of them. It sounds like it could be two things
1. you are low on refrigerant gas
2. the high limit thermostat (clixon) is cutting in.
Many refrigerators have 2 fans.
One , outside and underneath, is to cool the motor and/or the compressor.
The other, inside, is to circulate the cooled air to all of the areas of the inside .
Either one can become dirty, and make noises, and the one inside could also become covered with ice or frost and make noise as the blades hit the housing,
The outside underneath one is easy to clean.
I know of no way to clean the inside one except to take the whole inside of the fridge apart.
God bless your efforts.
Go to the T-49 parts list and page 7 by scrolling down=> HERE
The evaporator is on top of your refrigerator as illustrated on page 7. You are simply going to have to defrost any ice blocking the defrost drain and by using a turkey baster force hot water with Clorox through the drain elbow from the back drain line to clear the blockage Appliance 911
First, I'm not a TRUE Refrigerator tech, but I have worked on similar retail display beverage/food chillers.
* There is dangerous electrical equipment and High pressure refrigerant present in this equip. Only qualified CFR tech should service this equipment.
*** There are following is for information only.***
* the fan(s) are usually connected in parallel so if one is out and the other is still working then it's probably the fan. If you can't get a new fan from your service vendor you can order it from you nearest Grainger or Amazon.com. It's a pretty standard fan. Check and note what kind of connector is used so to order the motor with the correct connector.
* There is an off chance that the fans are on a separate line off the main fan switch (Like a double pole switch) or relay. Check the relay for burns. Normally the fan wires are jumpered together as they both are turned on at the same time. The jumper lug may be rusted, disconnected, or broken. Unless someone has serviced the fan(s) earlier the wires should be okay and it's just the fan. (it's a moving part that goes on and off all day long.)
* Have the electrician check if there is still power going to bad fan connector (after disconnecting bad fan) There should be power at the connector with the other fan powered up.
* Check your warranty before attempting repairs as these units usually have long warranty periods. Call for service anyway as there may be other problems that caused the fan to fail.