The GRACO 178090 Priming Piston is a critical component designed for use in GRACO oil and grease pumps. It is typically constructed from durable materials such as steel, brass, or aluminum, and is engineered to facilitate the priming process within the pump, ensuring efficient fluid intake and reliable operation.

Key Features:

• Priming Piston
• 6-1/2” (165.1 mm) Diameter
• Steel, brass, aluminum, acetal, nitrile rubber, polyurethane (wetted parts in typical GRACO pumps)
• Designed for use in GRACO oil and grease pumps, such as those with 50:1 ratio and Fire-Ball® 300 models
• Facilitates efficient priming of pump
• Durable construction for long service life
• Critical for reliable pump operation
• Ease of maintenance when following GRACO guidelines

Applications:
Used in GRACO oil and grease pumps for lubrication and maintenance applications across industries such as mining, agriculture, and manufacturing.

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, safety, and longevity of the equipment.
• Follow GRACO’s recommended torque specifications for related components (e.g., intake cylinder, piston rod, packing nut)
• Apply sealant to threads as specified in the manual
• Ensure proper alignment and secure fitment during installation
• Regularly inspect for wear and replace as needed to maintain pump efficiency
• Refer to the equipment manual for detailed installation and maintenance procedures
• Use only GRACO-approved replacement parts
• Perform routine maintenance checks to prevent downtime