What is the purpose of the hydraulic hand pump located on the right-hand side of the MHU-83 lift truck?

The purpose of the hydraulic hand pump located on the right-hand side of the MHU-83 lift truck is to operate the hydraulic system in case of engine failure. This pump provides a manual means to continue operating essential hydraulic functions when the main power source is not available, ensuring that personnel can safely maneuver equipment and complete necessary operations without relying solely on engine power. This is particularly vital in emergency situations where hydraulic functions are critical for safety and equipment handling.

The other options, while related to the functions and controls of the MHU-83 lift truck, do not accurately describe the primary purpose of the hydraulic hand pump. For example, while adjusting the boom angle and releasing the parking brake are important operations, they are typically managed through powered hydraulic controls when the engine is operational, not through a manual pump. Filling the hydraulic fluid reservoir is a maintenance task that does not pertain to the pump’s operational purpose in emergency scenarios.