Graco 164704 Cylinder Cap Nut
$153.50
In Stock
Graco 164704 – Cylinder Cap Nut secures the air-motor cylinder and trip rod for reliable sealing and alignment. Use when the original nut is worn, leaking, or won’t hold torque.
- Fits: Monark 23:1 air-motor assemblies
- Fits: Fire-Ball 15:1 pumps — models 206699, 206700
- Role: locks the cylinder to the upper housing; threads over the trip rod
- Tip: always confirm with your unit’s OEM schematic/serial range
Quantity
Genuine OEM Part
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164704 Overview & Compatibility
Compatible Machines
The following Graco pump families are confirmed to use Graco 164704 – Cylinder Cap Nut (verify against your unit’s parts list/serial range):
- Graco Monark® 23:1 airless spray pumps (air motor module)
- Graco Fire-Ball® 15:1 ratio pumps — models 206699 and 206700
Product Details
The Graco 164704 Cylinder Cap Nut secures the air-motor cylinder assembly, helping maintain proper alignment and sealing between the cylinder, trip rod, and upper air-motor components. If worn or damaged, the motor can loosen or leak; replacing this nut restores reliable operation.
Key Specifications
| Attribute | Details |
|---|---|
| Part Number | 164704 |
| Item Name | Cylinder Cap Nut (air-motor cylinder cap nut) |
| Function | Locks and seals the air-motor cylinder to the upper housing; threads onto trip rod during assembly/service. |
| Used On | Monark 23:1 air motors; Fire-Ball 15:1 (e.g., 206699/206700) |
| Replacement Tip | Inspect threads and sealing face; replace if rounded, cracked, or if air-motor shows loosening/leak. |
Frequently Asked Questions
Match your model and serial with the OEM parts list. For Monark 23:1 and Fire-Ball 15:1 (206699/206700) air-motor sections, 164704 is listed as the cylinder cap nut. If your schematic shows a different number, use that specific part.
Visible thread damage, difficulty maintaining torque, air leaks at the cylinder cap, or an air-motor that loosens during use. Replace the nut if threads are rounded or if sealing faces are worn.
Clean and lightly lubricate threads; ensure the trip rod and cylinder are correctly aligned. Thread the nut onto the rod first (as specified by your service manual), then torque to spec. Do not over-tighten—follow OEM guidance for your air-motor.
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