Shopping cart
Your Cart is empty
Graco 178888 Piston Rod Aftermarket | Bedford 57-1408
PriceQuantity
178888
MPN:57-1408
Manufacturer:Bedford Precision Parts
Guaranteed safe & secure checkout
Graco 178888 Piston Rod Replacement for King 45:1 GH733 and Bulldog 20:1 Airless Sprayers Aftermarket by Bedford 57-1408
The Bedford 57-1408 Piston Rod is a precision aftermarket replacement engineered to match the performance and fit of the original Graco 178888 Piston Rod used in high-output airless sprayers including King 45:1, GH733, and Bulldog 20:1 systems. As the primary drive link between the motor and fluid section, this rod converts reciprocating motion into dependable pumping action, maintaining stable pressure and a uniform spray pattern across demanding coatings. Manufactured from hardened stainless steel and polished to a mirror-like finish, it resists scoring and corrosion, reduces packing wear, and helps extend service intervals—delivering OEM-level reliability at an aftermarket value that keeps fleets productive and costs controlled.
Why Choose This Piston Rod
- Direct-fit dimensions align with OEM Graco 178888 for fast installation.
- Precision-ground surface reduces friction, heat, and packing wear.
- Excellent resistance to bending, scoring, and chemical attack.
- Restores pump output and pattern consistency under continuous duty.
Typical Compatibility
- Graco King 45:1 airless sprayers
- Graco GH733 pump systems
- Graco Bulldog 20:1 units
Verify the exact lower assembly in your parts manual to confirm fit before purchase.
Technical Specifications
| Aftermarket | Bedford 57-1408 |
|---|---|
| OEM | Graco 178888 |
| Fits | King 45:1, GH733, Bulldog 20:1 (model-dependent; confirm lower) |
| Type | Piston rod (drive linkage for pump lower) |
| Material | Hardened stainless steel, precision-ground and polished |
| Function | Transfers motor motion to the fluid section for pressure and flow |
| Operating Pressure | Use within the sprayer’s rated system pressure (see equipment manual) |
| Brand | Aftermarket by Bedford Precision Parts; replaces Graco |
Installation Notes
- Fully depressurize and disconnect power/air before service.
- Separate the motor and lower; inspect packings, sleeve, and bearings.
- Lubricate the new piston rod lightly; avoid contaminating packing lips.
- Reassemble and torque all fasteners per the service manual.
- Cycle slowly to verify alignment and sealing, then ramp to working pressure.
Tech Tip: Replace the rod whenever installing a new packing set or sleeve to keep sealing surfaces true and extend rebuild intervals.
When to Rebuild / Replace
- Visible scoring, pitting, or corrosion on the rod surface
- Recurring packing leaks or short packing life
- Pressure instability or pulsing at steady RPM
- Rod misalignment noise or abnormal heat at the packing area
Bedford vs OEM (Graco)
| Feature | Bedford Aftermarket (57-1408) | OEM (Graco 178888) |
|---|---|---|
| Fit & Function | OEM-equivalent dimensions; installs without modification | Original equipment specification |
| Material | Hardened stainless steel with polished finish | High-grade polished steel |
| Durability | Engineered to resist scoring and corrosion in continuous duty | Factory-rated longevity |
| Availability | If in stock, ships from Bedford Precision Parts in Bedford Hill, New York. | Ships per OEM distributor inventory |
| Value | OEM-level performance at a lower aftermarket cost | Higher upfront price |
Frequently Asked Questions
Bedford 57-1408 replaces the Graco 178888 piston rod used in King 45:1, GH733, and Bulldog 20:1 pump lowers.
It is manufactured from hardened stainless steel and precision-polished to extend packing life and reduce friction.
Yes. Installing a new rod with a fresh packing set ensures proper sealing and prevents premature wear.
Yes. The polished, hardened surface is designed for continuous duty with demanding materials when used within system specs.
When available, Bedford aftermarket parts typically ship quickly from Bedford Hill, NY. Contact us for current stock and cutoff times.
Bring your Graco sprayer back to spec with a precision piston rod. Order the Bedford 57-1408 today to restore smooth, consistent pumping performance.
