About the Graco 176818 Straight Pin
The Graco 176818 Straight Pin is an OEM, headless attach/connecting pin used in the pump linkage (commonly at the top of the piston rod or connecting rod) on select Graco sprayers and proportioners. It restores secure, slop-free linkage to maintain smooth pump stroke and consistent spray performance.
Compatible Machines
- Graco Ultra Max II 695
- Graco Ultra Max II 795
- Graco 395 ST
- Graco 395 ST Pro
- Graco E-20 Proportioner
- Graco EXP-1 Proportioner
Tip: If your exact model isn’t listed, check your unit’s parts diagram for “176818” to confirm fit.
Key Features & Benefits
- OEM-grade fit and durability for reliable linkage retention.
- Headless straight-pin design for compact seating and proper alignment.
- Restores precision at the piston/connecting-rod interface to reduce wear and chatter.
- Quick replacement—drop-in part for listed machines when used per service manual.
Specifications
| Part Number | 176818 |
| Part Type | Straight Pin (attach/connecting pin, headless) |
| Typical Position | Top of piston rod / pump connecting-rod linkage (model-dependent) |
| Approx. Dimensions* | Length ~ 1.05 in; Diameter ~ 0.20 in |
| Compatibility | See Compatible Machines list above |
| What's Included | 1 × Graco 176818 Straight Pin |
*Dimensions are typical values from supplier listings; always verify against your machine diagram.
Installation & Service Notes
- Depressurize the sprayer and follow all Graco safety procedures before service.
- Inspect mating parts (linkage bores, bushings) for wear; replace if elongated or damaged.
- Install the pin per the unit’s parts manual; secure with the specified retainer (if applicable).
- Cycle the pump at low pressure to confirm smooth movement and proper seating.
Frequently Asked Questions
Yes—this pin is listed for Ultra Max II 695 and 795 models in supplier parts listings. Always verify with your exact model revision and parts diagram.
It’s typically installed at the top of the piston rod or through the connecting-rod linkage, securing and aligning the pump motion path (location varies by model).
The package generally includes the pin only. If your assembly requires a retainer/clip, order it separately according to your sprayer’s parts breakdown.
Check your unit’s parts manual or on-unit label for the part number 176818. If it appears in the pump/linkage diagram, it’s the correct replacement.
Excessive linkage play, uneven pump stroke, knocking/chatter, or visible wear/elongation at the pin bore usually indicate it’s time to replace the pin and inspect related bushings.
