Final answer:
The surge suppressor gauge should be precharged to the value specified in the Beta-Freightliner R-12 service manual, typically 70-80% of the system's minimum working pressure. Accurate precharge is essential for system protection.
Step-by-step explanation:
The surge suppressor gauge on the Beta-Freightliner R-12 Hydrant-Servicing Unit should be precharged to a specific value according to the manufacturer's specifications or the equipment's service manual.
Typically for most hydraulic systems, a precharge pressure of about 70-80% of the minimum system working pressure is common, but it is essential to reference the service manual of the specific Beta-Freightliner R-12 unit you're working with to find the precise value required. Maintaining a correct surge suppressor precharge is critical for the protection of the hydrant-servicing system from pressure surges or spikes that could cause damage to the system.