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Jacobsen LF 3400 - Service Manual

Jacobsen LF 3400
270 pages
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RJ 100 012003
WARNHINWEIS: Wenn diese Maschine nicht ordnungsgemäß
verwendet wird, können ernsthafte Verletzungen verursacht
werden. Personen, die diese Maschine verwenden und
warten, müssen in ihrer richtigen Verwendung ausgebildet
sein, auf die Gefahren aufmerksam gemacht worden sein
und die Anleitung ganz gelesen haben, bevor sie versuchen,
die Maschine aufzustellen, zu bedienen, einzustellen oder
zu warten.
WAARSCHUWING: Bij verkeerd gebruik kan deze machine
ernstig lichamelijk letsel veroorzaken. Degenen die de machine
gebruiken en onderhouden moeten worden getraind in het
juiste gebruik ervan, worden gewaarschuwd voor de
gevaren ervan en behoren de volledige handleiding
aandachtig te lezen alvorens de machine bedrijfs-klaar te
maken, te bedienen, af te stellen en/of te onderhouden.
AVERTISSEMENT : Risque de blessures graves en cas
d’utilisation incorrecte de la machine. Les opérateurs et le
personnel d’entretien doivent être formés et conscients des
dangers encourus. Ils doivent lire avec attention le manuel
avant d’essayer de monter, d’utiliser, de régler ou maintenir la
machine.
WARNING: If incorrectly used this machine can cause severe
injury. Those who use and maintain this machine should be
trained in its proper use, warned of its dangers and should
read the entire manual before attempting to set up, operate,
adjust or service the machine.
AVVERTENZA: Questa macchina può causare gravi infortuni
se viene utilizzata in modo errato. Prima di accingersi ad
approntare, usare, mettere a punto o eseguire la manutenzione
di questa macchina, coloro che la utilizzano ed i responsabili
della manutenzione devono essere addestrati all’impiego della
macchina, devono essere informati dei pericoli, e devono
leggere l’intero manuale.
Parts and Maintenance Manual
Nomenclature Des Pieces De Rechange
& Manuel De Maintenance
Onderhouds - En Onderdelenhandleiding
Wartungsanleitung Und Stückliste
Manuale Per La Manutenzione E Dei Ricambi
LF 3400
TM
, LF 3800
TM
, LF4675
TM
, LF4677
TM
4100741-ML1 (rev.0)
LF 3400 Model: 2 WD 5 gang 67868 Serial No. 2800 & up & 4WD 5 gang 67869 Serial No. 2250 & up - Engine type: Kubota D-1305E
LF 3800 Model: 2 WD 5 gang 67866 Serial No. 2300 & up & 4WD 5 gang 67867 Serial No. 2300 & up - Engine type: Kubota D-1505E
LF 3400 Model: 4 WD 5 gang 67889 Serial No. 1670 & up - Engine type: Kubota V1505-TE
LF 4675 Model: 4 WD 7 gang 67915 Serial No. 1651 & up - Engine type: Kubota V1505-TE
LF 4677 Model: 4 WD 7 gang 67916 Serial No. 1651 & up - Engine type: Kubota V1505-TE

Table of Contents

Other manuals for Jacobsen LF 3400

Questions and Answers

  • T
    Tyler BurkeAug 18, 2025
    Why my Jacobsen LF 3400 Lawn Mower engine will not start?
    • M
      Mason LesterAug 18, 2025
      If your Jacobsen Lawn Mower engine won't start, several factors could be at play. First, ensure the parking brake is engaged, the traction pedal is in neutral, and the mow switch is off, as the interlock system could be preventing ignition. Also, make sure the glow plug has timed out by resetting the ignition switch. Check the battery's condition and connections, and ensure the fuel tank has fresh fuel. Replace the fuel filter and bleed the fuel lines if needed. Finally, inspect the fuse and relays, replacing them if defective. Adjust or replace the neutral switch on the traction pedal if it's out of adjustment or defective.
  • C
    christophergravesAug 20, 2025
    How to troubleshoot Jacobsen LF 3400 engine that is hard to start?
    • S
      Samantha WebbAug 20, 2025
      If your Jacobsen Lawn Mower engine is hard to start or running poorly, start by checking the fuel level and ensuring the fuel and fuel filter are clean. Fill the tank with fresh fuel, change the fuel filter, and bleed the fuel lines. Next, inspect and replace the air filter if it's dirty. For issues with the injectors or fuel pump, or if you suspect a more complex engine problem, consult the engine manual.
  • S
    Stephanie YoungAug 23, 2025
    What to do if my Jacobsen LF 3400 engine is overheating?
    • L
      Luis JohnsonAug 23, 2025
      If your Jacobsen Lawn Mower engine is overheating, begin by inspecting and adding coolant if the level is low. Then, check the air intake at the radiator and clean it if it's restricted. Lastly, inspect the water pump belt and tighten or replace it if it's broken or loose.
  • E
    Eric Brown DDSAug 26, 2025
    Why does my Jacobsen Lawn Mower engine keep stopping?
    • E
      eballAug 26, 2025
      If your Jacobsen Lawn Mower engine stops unexpectedly, first check if the fuel tank is empty and, if so, fill it with fresh fuel and bleed the fuel lines. Another possible cause is related to the interlocks; ensure they are properly set before leaving the operator’s seat by engaging the parking brake and setting the mow switch to OFF.
  • K
    Kyle ContrerasAug 27, 2025
    Why is my Jacobsen Lawn Mower engine overheating?
    • S
      sellersshawnAug 27, 2025
      Your Jacobsen Lawn Mower engine might be overheating due to a low coolant level. Inspect and add coolant as needed. Also, check for any restrictions in the air intake at the radiator and clean it. A broken or loose water pump belt can also cause overheating, so tighten or replace the belt.
  • R
    rharrisAug 30, 2025
    What to do if my Jacobsen Lawn Mower engine is hard to start or runs poorly?
    • M
      Marc ParkAug 30, 2025
      If your Jacobsen Lawn Mower engine is hard to start or runs poorly, start by filling the tank with fresh fuel and changing the fuel filter if it's dirty. Bleed the fuel lines. Inspect and replace the air filter if it's dirty. For issues with the injectors or fuel pump, or if you suspect a more complex engine problem, consult the engine manual.
  • D
    Debbie JordanSep 1, 2025
    Why is my Jacobsen LF 3400 causing washboarding?
    • M
      Michael RamirezSep 1, 2025
      Washboarding can occur on your Jacobsen Lawn Mower if the mowing speed is too fast. To resolve this, reduce the mowing speed. Also, clean the roller and use scrapers or brushes if grass builds up on the roller. If the roller is out of round, replace it. Change mowing direction regularly and ensure groomers are used only in a straight line to prevent washboarding.
  • B
    bdodsonSep 4, 2025
    How to fix Jacobsen Lawn Mower battery not holding charge?
    • J
      Joshua NelsonSep 4, 2025
      If the battery on your Jacobsen Lawn Mower isn't holding a charge and the battery light is on, begin by inspecting and cleaning any loose or corroded battery terminals. If the electrolyte level is low, refill it to the correct level. Also, check the alternator belt, tightening or replacing it if it's loose or broken. For issues related to the charging system, please refer to the engine manual.
  • B
    Barry PottsSep 7, 2025
    What causes uneven cuts with Jacobsen LF 3400 reels?
    • M
      Margaret VasquezSep 7, 2025
      If the reels on your Jacobsen Lawn Mower are cutting unevenly, several adjustments might be needed. Start by inspecting the bedknife-to-reel adjustment. Check the engine speed to ensure it's not too low. Adjust the mow speed to suit the turf conditions. Ensure the mow switch is set for forward rotation. If there's not enough rear roller pressure, move the down pressure spring one hole towards the spring. If the front roller isn't following undulations adequately, move the down pressure spring one hole away from the spring.
  • M
    Monica DavisSep 9, 2025
    Why is the battery on my Jacobsen LF 3400 not holding charge?
    • W
      William HuntSep 9, 2025
      If your Jacobsen Lawn Mower battery isn't holding a charge and the battery light is on, begin by inspecting and cleaning any loose or corroded battery terminals. If the electrolyte level is low, refill it to the correct level. Check the alternator belt for looseness or damage, and tighten or replace it as necessary. If the charging system is defective, consult the engine manual.

Summary

Safety Information

Operating Safety Rules

Details safe operating practices, warnings, and precautions for machine use.

Important Safety Hazard Definitions

Provides definitions for DANGER, WARNING, CAUTION, and interlock system safety.

Machine Specifications

Engine Specifications

Provides technical data for Kubota diesel engines used in the machines.

Adjustments and Settings

Bedknife, Cutting Height & Mow Speed

Covers bedknife-to-reel, cutting height, and mow speed adjustments.

Maintenance Procedures

Engine and Fuel System Care

Covers engine break-in, oil changes, filters, and fuel handling.

Battery and Electrical System Service

Instructions for battery service, jump starting, and electrical system care.

Hydraulic System Maintenance

Covers hydraulic hose, oil, and filter maintenance procedures.

Troubleshooting Guide

Common Problems and Solutions

Lists common symptoms, causes, and actions for troubleshooting.

Maintenance and Lubrication Charts

Service and Lubrication Schedule

Lists recommended service and lubrication intervals for machine components.

Parts Catalog and Diagrams

Jacobsen LF 3400 Specifications

General IconGeneral
Cutting Width100 inches
Number of Reels3
Engine TypeDiesel
TransmissionHydrostatic
Speed Range0-8 mph
Deck MaterialSteel
Blade TypeReel
EngineKubota Diesel

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