The Graco LineLazer 3400 is the professional choice for 1-gun parking lot striping — Honda gas engine, 3,300 PSI, 0.75 GPM, and the proven 246428 displacement pump. Every OEM replacement part for both 248861 (1st gen) and 25M224 (2nd gen) models, shipped same day from Houston, TX.
Model 25M224 (2nd Gen current) · Model 248861 (1st Gen) — professional 1-gun gas line striper
Genuine OEM replacement parts for the Graco LineLazer 3400 — both 248861 (1st gen) and 25M224 (2nd gen) models stocked. Every part ships factory-sealed from Graco's authorized distribution chain.
Per Graco's official LineLazer 3400 manual (3A4587), the first task before every use is checking and filling the TSL (Throat Seal Liquid) in the displacement pump packing nut. TSL lubricates the piston rod and throat packings on every stroke of the pump.
A dry packing nut is the leading cause of premature packing wear and rod scoring on the LineLazer 3400. Keep TSL on the machine at all times. Check the level before every striping session — not just daily if running multiple sessions per day.
The LineLazer 3400 is a gas-powered machine — it requires Honda engine maintenance in addition to pump maintenance. Per the official manual:
Daily: Check engine oil level before every use. After every 25 hours: Drain and refill engine oil with clean oil (correct viscosity per the Honda GX120 manual). Weekly: Remove and clean the air filter element — replace if worn. For engine parts (oil, air filter, spark plug), refer to your Honda dealer. For pump parts, we stock everything listed below.
The LineLazer 3400 was produced in two generations. 1st Generation: Model 248861 · 2nd Generation: Model 25M224 (current). Both use the same displacement pump (246428), packing kit (18B260), and TSL. Frame components, control boards, clutch assemblies, and some mechanical parts differ between generations. Your model number is on the machine's serial plate. Not sure? Call 713-931-4102 — we'll confirm in under 2 minutes.
The LineLazer 3400 requires both pump maintenance and Honda engine maintenance. Following this schedule prevents the majority of field failures.
| Frequency | Task | Part / Product | Notes |
|---|---|---|---|
| Before every use | Check and fill TSL in pump packing nut | TSL Throat Seal Liquid | Most critical daily task — per official Graco manual |
| Before every use | Check Honda engine oil level | Engine oil (correct viscosity) | Per Honda GX120 manual |
| Before every use | Check pump packing — 15-second test | 18B260 packing kit if needed | Pull trigger 5 sec, count motor restart interval |
| Every 25 hours | Drain and refill engine oil | Engine oil — see Honda manual for viscosity | Per Honda GX120 maintenance schedule |
| Weekly | Clean or replace air filter element | Honda air filter (Honda dealer part) | Daily in unusually dusty environments |
| At service intervals | Rebuild pump packings | 18B260 packing kit 239922 intake seat | Always replace seat at same time as packings |
| Seasonally | Inspect clutch assembly | Clutch kit — confirm via parts diagram | Slipping or unresponsive clutch reduces pressure buildup |
| Seasonally | Check distance sensor wheel | Distance sensor — confirm via parts diagram | Calibrates line spacing accuracy |
| Symptom | Most Likely Cause | Part / Action |
|---|---|---|
| Machine runs — won't prime or no paint flow | Intake valve ball not seating / packed with material | Clean intake valve · 239922 seat if worn |
| Pressure weak — pump test under 10 seconds | Worn pump packings | 18B260 packing kit 239922 intake seat |
| TSL / fluid weeping from packing nut | Packing wear — piston rod exposed | 18B260 packing kit · Check 239922 seat |
| Machine starts but pump doesn't engage | Clutch slipping or worn | Clutch kit — confirm via parts diagram |
| Striper walks crooked / distance sensor fault | Distance sensor or wheel misaligned | Distance sensor — confirm via parts diagram |
| Tip clogging frequently | Unstrained material / worn tip | LL5319 striping tip · Strain material before loading |
| Engine won't start | Engine issue — not pump | Refer to Honda GX120 manual / Honda dealer |
| Part # | Description | Category | Replace When |
|---|---|---|---|
| 18B260 | Pump Packing Repair Kit (supersedes 244194) | Pump Fluid Section | Motor cycles <10 sec · TSL weeping · Weak pressure |
| 239922 | Intake Valve Seat (carbide) | Pump Fluid Section | Replace at EVERY packing service — prevents won't-prime failure 60 days later |
| 246428 | Displacement Pump (complete replacement) | Pump Assembly | Cylinder scored · Rebuild kit can't restore performance |
| TSL (various) | Throat Seal Liquid — 8 oz / 1 qt / 1 gal | Maintenance Fluid | Check before every use · Top up to fill line daily |
| 287053 | Connecting Rod | Drive Assembly | Visible wear, cracking, or drive assembly repair |
| 287487 | Front Cover, Painted | Frame / Housing | Cover damaged or cracked |
| 246385 | Inlet Strainer — 7/8-14 unf | Fluid Inlet | Clogged or damaged — clean or replace |
| 287376 | Pinion Housing | Drive Assembly | Drive failure, clutch engagement issues |
| 287482 | Coil Repair Kit | Pinion / Drive | Electrical fault in coil — confirm via pinion housing diagnosis |
| LL5319 | Striping Tip — Standard | Spray Tip | Line edges fuzzy · Tip worn or clogged |
| 248157 | Flex Gun Assembly | Gun Arm | Gun dripping · Gun body cracked · Valve worn |
The 239922 tungsten carbide intake valve seat costs approximately $28. Replace it every time you rebuild the packings (18B260 kit). A worn seat that passes inspection today will cause a won't-prime failure within 60 days of a fresh packing rebuild — requiring a second full teardown for a $28 part. This is the highest-ROI maintenance habit for the LineLazer 3400 and all Graco contractor pumps that use the 246428 displacement pump.
Authorized Graco dealer since 2010
All parts come directly from Graco with full manufacturer warranty. We never sell aftermarket substitutes or knock-off components that void your warranty.
Genuine Graco parts for both 248861 (1st gen) and 25M224 (2nd gen) in our warehouse ready to ship. Same-day shipping before 1pm CST, Monday–Friday.
Our team knows the LineLazer 3400's pump system, clutch assembly, and distance sensor inside out. We'll confirm the right part for your generation and serial number.
We stock LineLazer-specific parts that general sprayer parts suppliers don't carry — clutch kits, pinion housing components, distance sensors, and striping tips.
Best prices on genuine Graco LineLazer parts. The 18B260 packing kit and 239922 seat are the two highest-volume LineLazer parts — always in stock at competitive pricing.
Interactive exploded-view parts diagrams for the LineLazer 3400 — both generations. Click any component to get the exact OEM part number before ordering.
Common questions about Graco LineLazer 3400 parts, maintenance, and ordering