JLG 450AJ Service Manual (English)

Other manuals for JLG 450AJ

Service And Maintenance Manual148 pages

Operator's And Safety Manual70 pages

Questions and Answers:

P
Pamela CrawfordAug 8, 2025
What to do if JLG 450AJ Boom Lifts system is overheating?
- R
  Randy RodriguezAug 8, 2025
  If the heat exchanger isn't receiving enough airflow or is in poor condition, it might not be able to cool the system adequately. Make sure the heat exchanger is getting enough air and is in good working order. Repair or replace it if necessary. Also, if a system relief valve becomes unseated for a long time or fails, the system could overheat. Repair or replace any faulty relief valves, and make sure the machine's loads aren't too high.
J
Jennifer BartonAug 12, 2025
How to fix overheating issues in JLG 450AJ?
- C
  Charles HernandezAug 13, 2025
  If a system relief valve becomes unseated for an extended period or fails, it can cause overheating. Repair or replace any malfunctioning relief valves and verify the machine loads are not excessive. Insufficient hydraulic fluid will also prevent meeting system cooling demands, so fill the reservoir to the proper level.
C
carlsonmollyAug 17, 2025
What causes slow shifting in JLG 450AJ?
- P
  pgordonAug 17, 2025
  Check that the signal lines aren't blocked or restricted, and that there's enough signal pressure to shift the motor. Also, make sure the correct control orifices are installed in the motor and that they aren't blocked. Clean or replace them if needed, as the supply and drain orifices control how fast the motor shifts.
M
Marcus MarshallAug 23, 2025
How to reduce excessive noise and vibration in JLG 450AJ?
- B
  Brittney DoughertyAug 23, 2025
  Several factors can cause excessive noise and vibration in JLG Boom Lifts: * Insufficient hydraulic fluid can lead to cavitation. Fill the reservoir to the correct level and ensure the oil supply to the motor is adequate and the lines are unobstructed. * Air trapped in the system lines or motor can also cause cavitation. Make sure that the system lines and components are purged of air. * A loose or incorrect shaft coupling will produce vibrations. Ensure the correct coupling is used and fits properly on the shaft. * Misaligned shafts create excessive frictional vibration. Ensure that the shafts are properly aligned. * Viscosity above acceptable limits will result in cavitation. Replace the hydraulic oil with the appropriate fluid for the operating conditions.
B
Brandon McdanielAug 27, 2025
Why won't my JLG 450AJ Boom Lifts shift or is slow to start?
- L
  Lisa PenaAug 27, 2025
  Obstructed or restricted flow through the servo control signal lines could cause slow or no shifting. Ensure the signal lines are not obstructed or restricted and that the signal pressure is adequate to shift the motor. Also, supply and drain orifices determine motor shift rate. The smaller the orifice, the longer it takes to shift the motor, and obstructions increase shift times. Ensure proper control orifices are installed in the motor and check they are not obstructed. Clean or replace as needed.
S
Sheryl CruzSep 1, 2025
How to fix shaft coupling noise in JLG Boom Lifts?
- K
  klewisSep 1, 2025
  To address noise from JLG Boom Lifts, ensure the correct coupling is used and fits properly on the shaft. Also, verify that the shafts are properly aligned.

JLG 450AJ Specifications

General

Platform Height	45 ft
Lift Capacity	500 lbs
Power Source	Diesel
Platform Capacity - Unrestricted	500 lbs
Jib Length	5 ft
Platform Rotation	180 Degrees
Gradeability - 2WD	30%
Ground Clearance	1 ft
Horizontal Outreach	25 ft
Horizontal Reach	25 ft
Swing	360 Degrees Continuous