The Graco LineLazer 3400 runs a 3300 PSI / 0.75 GPM displacement pump (part 246428, Ref. 27) driven by a 4.0 HP gasoline engine — enough for standard parking lot and road striping with most paint and thermoplastic materials. This guide decodes the official pump and drive train diagram, straight from Graco's own parts manual, with real reference numbers matched to genuine part numbers.
This is a decoded reference for the LineLazer 3400's official displacement pump and drive train diagram, straight from Graco's parts manual (311019), covering the components striping crews service most often.
1. Displacement Pump Callouts
| Ref. | Component | Part Number |
|---|---|---|
| 27 | Displacement Pump | 246428 |
| 29 | Connecting Rod | 287053 |
| 30 | Pump Jam Nut | 195150 |
| 31 | Straight Pin | 196762 |
Graco's manual specifically flags that if the pump jam nut (Ref. 30) loosens during operation, the threads of the bearing housing and drive train can be damaged. Tighten it to the specified torque, not just "snug" — this is one of the more consequential steps in the whole assembly.
2. Drive Train Callouts
| Ref. | Component | Part Number |
|---|---|---|
| 33 | Garden Hose Washer | 115099 |
| 37 | Parallel Key | 183401 |
| 38 | Shaft Collar | 193680 |
Ref. 33 (115099) is included in Suction Hose Kit 249356 — if you're already replacing the suction hose, this washer comes along with it rather than needing a separate order.
3. Clutch Assembly Callouts
Several drive-train components are bundled into Clutch Replacement Kit 241109 rather than sold individually — the armature, hub, and rotor assemblies that typically need attention together during a clutch service.
| Component | Included In |
|---|---|
| Armature, Clutch (4 in.) | Clutch Replacement Kit 241109 |
| Hub, Armature | Clutch Replacement Kit 241109 |
| Rotor, Clutch (4 in.) | Clutch Replacement Kit 241109 |
4. 1st vs. 2nd Generation Models
The LineLazer 3400 has been produced across at least two distinct generations — the 1st generation (model 248861) and the 2nd generation (model 25M224) — each with its own dedicated manual. Assemblies and part numbers can vary between production years even on machines that look identical.
Before ordering any part, confirm your machine's serial number (found on the frame) rather than assuming compatibility based on the general "LineLazer 3400" name alone — this single step prevents the majority of ordering mismatches on this platform.
5. Core Machine Specs
| Spec | Value |
|---|---|
| Maximum Pressure | 3300 PSI |
| Flow Rate | 0.75 GPM |
| Engine | 4.0 HP gasoline |
| Typical Application | Parking lots, roads, mini malls, schools, park and recreation departments |
For higher-viscosity fluids or wider spray widths than the 3400 is rated for, a higher-volume unit like the LineLazer 5900 may be the better fit — worth checking with the fluid manufacturer's equipment sheet before committing to a machine size.
Shop Genuine LineLazer 3400 Parts
Find pump kits, clutch assemblies, and drive train components for your striping rig.
Shop LineLazer 3400 PartsShop the Parts You Need
Frequently Asked Questions
What is the pump part number for the Graco LineLazer 3400?
246428, listed as Ref. 27 on the official diagram — the same pump used across several related Graco models including certain 190 Express and Rental Pro configurations.
What's included in the Clutch Replacement Kit for the LineLazer 3400?
Kit 241109 bundles the armature, hub, and rotor assemblies involved in a clutch service, rather than requiring each piece ordered individually.
What is the flow rate and pressure rating of the LineLazer 3400?
3300 PSI at 0.75 GPM, powered by a 4.0 HP gasoline engine — sufficient for standard parking lot and road striping with most paint and thermoplastic materials.
Why does my part number differ from what's listed for a given reference number?
Assemblies can vary by production year and generation (1st generation 248861 vs. 2nd generation 25M224). Always confirm using the serial number on the frame before ordering.