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You will only be able to check this with a working Tachometer.
Checking the Maximum Speed at No Load
You are only going to maintain the Max Speed momentarily; just long enough to get a reading.
Also it could be helpful to have someone stand by the Manual Shutoff Lever on the odd chance of a runaway.
With the Transmission in park and the Engine completely up to operating temp. Floor the accelerator Pedal and read the highest RPMs you were able to obtain.
The speed should max out at between 4200-5200 RPMs.
If the RPM goes up within that range it is OK.
If it does not go high enough pop the Linkage off of the Throttle Lever and have someone you trust do the Tachometer Reading and push the Throttle lever by hand to Max Fuel momentarily and have that person take the reading.
If the RPM is OK this way you have a problem with your Linkage Adjustment.
If the RPM still does not go up high enough see below.
If it does not go up to high enough RPMs take a look at the Throttle Stop Screw on the Engine side of the Fuel Injection Pump and see if it is backed out too far.
It is the Bolt/Screw in the Red outlined Box in the Thumbnail pic.
Turning the Screw in as if to tighten it increases the RPMs because it allows the Throttle Arm to move forward more and put more pressure on the Governor spring.
If adjusting the Throttle Stop Screw does not help you have something internal to the Fuel Injection Pump Governor that is causing the Problem.
Some causes are a Broken Governor Spring or if the part on the Throttle lever inside of the IP has come loose it will not put pressure on the Governor spring properly.
Also check and see if the Throttle Lever itself is not slipping on the Throttle shaft.
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84 300D, 82 Volvo 244Gl Diesel
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