Compatible Machines
- GH 833 (models 249318, 249617, 253471, 253472)
- GH 933 (model 16U783)
- GH 2570 – referenced in parts list including part 120138
Product Overview
Introducing the 120138 SCREW, CAP, SOCKET HEAD, SPECIAL — a genuine Graco high-strength socket-head cap screw engineered for demanding hydraulic spray equipment applications. This part is specified in the parts breakdown of various Graco Big Rig hydraulic sprayer models, ensuring you get the correct OEM fastener for critical assemblies.
Key Features & Benefits
| Feature | Benefit |
| Socket-head cap design | Allows secure installation with Allen/hex key in tight spaces and ensures proper torque retention. |
| OEM original part | Maintains fitment, durability and performance for Graco hydraulic sprayer assemblies. |
| High-stress application ready | Used in equipment rated up to 4,000 psi / 27.6 MPa (e.g., GH 833 series) |
Suggested Use & Installation Tips
- Use this screw when repairing or rebuilding the hydraulic motor/pump assembly of the listed compatible machines.
- Clean mating surfaces and threads before installing to ensure correct preload and avoid loosening under vibration.
- Refer to your machine’s service manual for proper torque values — over- or under-tightening may compromise performance.
- Replace if the screw head or thread shows signs of wear, corrosion or deformation — genuine parts help extend machine life and reliability.
Frequently Asked Questions
This screw is listed in parts documentation for the GH 833 and GH 933 series hydraulic sprayers and also appears in the parts list for GH 2570 models. Please verify your model number before ordering.
While third-party fasteners may fit physically, using the genuine Graco screw ensures correct material specification, thread engagement and is backed by the OEM parts list. For critical hydraulic assemblies operating at high pressures, OEM reliability is strongly recommended.
Ensure the screw is installed in a clean, dry threaded hole; apply correct torque; check that head is flush and aligned; after first use inspect for looseness or deformation. Also review the machine’s operator or repair manual for any specific instructions.
If your machine model is not listed above, please verify the OEM parts manual or contact your authorized distributor to confirm compatibility.
