Failure to install the quick release pin after using the hand pump may cause obstruction of the AC motor pump selector valve and damage to equipment.

• A. Obstruction of AC motor pump selector valve and damage to equipment
• B. No effect
• C. Overheating
• D. Electrical short

Answer: (A)

The quick release pin is there to keep the hydraulic flow path clear and prevent foreign material from entering the AC motor pump selector valve when using the hand pump. If the pin isn’t installed, the pin itself or debris can enter and obstruct the valve’s passages. This obstruction stops proper hydraulic flow, can cause abnormal pressure, and may damage the valve, the pump, and associated components. Electrical short isn’t tied to this mechanical pin, and while restricted flow can lead to higher pump load and potential overheating as a secondary issue, the immediate and direct risk described is the obstruction and resulting equipment damage.