Hyundai 25L-7 - Service Manual

Questions and Answers

L
Lisa WilliamsAug 18, 2025
What to do if power is not transmitted in my Hyundai 25L-7?
- J
  John TaylorAug 18, 2025
  If power is not being transmitted in your Hyundai Forklifts, it could be due to several issues. Start by checking the oil level and adding oil if necessary. A damaged clutch plate could be the problem; listen for abnormal sounds at low converter speed and replace if damaged. Inspect the oil pump driving system for wear on the pump gear, shaft, and spline, replacing any defective parts. Other potential causes include a broken shaft, lack of oil pressure, improperly positioned inching valve and link lever or forward/reverse spool and link lever. Also, check for a clutch that fails to disengage or is seizing, a broken clutch snap ring, or a damaged clutch drum. For each of these, you should disassemble, check, and repair or replace the faulty components.
J
John BoydAug 28, 2025
What to do if Hyundai 25L-7 has unusual oil pressure?
- R
  Richard BrennanAug 28, 2025
  If your Hyundai Forklifts is experiencing unusual oil pressure, a malfunctioning control valve could be the cause; check its spool operation and replace the valve if necessary. In cold weather with high oil viscosity, consider changing the oil if the atmospheric temperature is below freezing. The use of improper oil can also lead to pressure issues, so check and change the oil. Other potential causes include a malfunctioning (worn) gear pump, excessive oil leaks, or air being sucked in. Low oil level or a clogged oil filter can also contribute to unusual pressure. For issues like gear pump malfunction, excessive oil leaks, or air suction, disassemble, check, and repair or replace the affected components.
F
floresronaldSep 2, 2025
What could cause Hyundai 25L-7 Forklifts to not transmit power, even after initial troubleshooting?
- B
  Brian LeeSep 2, 2025
  If power is still not being transmitted in your Hyundai Forklifts, even after initial checks, consider the possibility of foreign matter intruding into the oil passage to the clutch. Another potential cause is a worn shaft spline. In both cases, you should disassemble, check, and repair or replace the affected components.
L
leblancangelaNov 7, 2025
Why is the oil temperature rising excessively in my Hyundai Forklifts?
- M
  Mrs. Patricia TrujilloNov 7, 2025
  If your Hyundai Forklifts experiences an excessive oil temperature rise, it could be due to several reasons. First, check the oil level and adjust as needed by adding or draining oil. Another potential cause is the impeller interfering with its surroundings, which requires draining the oil and transmission to inspect and replace any parts causing interference. A malfunctioning stator and free wheel can also be the reason, so check the engine stalling speed and replace if necessary. Additionally, inspect the inlet side joint or pipe for air being sucked in, and retighten the joint or replace the gasket if needed. If water has intruded into the transmission case, check the drained oil and change it if necessary. Other causes include worn or seizing bearings, which would require disassembly, ...
J
Justin KentNov 12, 2025
Why does my Hyundai 25L-7 have low output power?
- M
  mercedes41Nov 12, 2025
  If your Hyundai Forklifts has low output power, start by checking the oil level and adding oil if it's insufficient, as low hydraulic pressure could be the cause. Inspect joints and pipes for leaks. If air is being sucked in, check and replace the affected components. A clogged oil filter may also be responsible; check the oil pressure and replace the pump if needed. Other potential causes include a worn oil pump (resulting in low delivery flow), fatigued regulator valve coil spring, or a malfunctioning control valve spool, each requiring disassembly, inspection, and repair or replacement. Also, check for worn piston or O-rings, stator free wheel cam damage, deformed flexible plate, or stator free wheel seizing. Contamination in the oil, such as water or air bubbles, can also reduce power....
A
April LawrenceNov 22, 2025
How to troubleshoot noise operation in Hyundai 25L-7 Forklifts?
- K
  Kelly SanchezNov 22, 2025
  If your Hyundai Forklifts is making unusual noises, it could be due to several causes. Cavitation could be the reason, so change the oil and replace any parts that are leaking air. A damaged flexible plate can also cause noise; listen to the rotating sound at low speed and replace the plate if necessary. Other potential issues include damaged or worn bearings or gears, which require disassembly, inspection, and replacement. Additionally, the impeller might be interfering with its surroundings, so check the impeller and drained oil for foreign matter, changing the oil if needed. Loose bolts or a worn spline can also cause noise, requiring disassembly and checking; retighten or replace as necessary. Finally, dragging caused by a seizing clutch can produce noise; check if the machine moves in...