Make sure you are accessing this file directly from www.steam-brite.comIt seems you are trying to get it from https://steam-brite.com/literature/schematics/index.php?dir=Prochem%2FTruckmounts%2F&file=980217-APEX+GAS+%26+DIESEL.pdf
Your IP address has been logged.
18.191.107.181 (ec2-18-191-107-181.us-east-2.compute.amazonaws.com)
Here is a link to the directory index the file is in:
http://www.steam-brite.com/literature/schematics/index.php?dir=Prochem/Truckmounts/