07-05-2025, 04:09 AM
A user on panswork reported an issue with their 1998 Bobcat 753 F Boss skid steer, specifically with the glow plug system. The glow plugs failed to operate correctly, and there was no countdown when starting the machine. This led to difficulty in starting the engine, especially in colder conditions.
Possible Causes
The issue of the glow plugs not working correctly and the absence of a countdown timer on a 1998 Bobcat 753 F Boss skid steer can be caused by a variety of factors, including faulty relays, timer malfunctions, wiring issues, or defective glow plugs. By systematically checking each component, users can identify and fix the issue, improving the starting performance of their machine.
Possible Causes
- Faulty Glow Plug Relay
One of the primary reasons for the glow plug issue is a malfunctioning glow plug relay. If the relay does not engage properly, it will prevent the glow plugs from heating up, and the countdown timer may not be triggered.
- Glow Plug Timer Malfunction
The glow plug timer controls the countdown sequence. If this timer malfunctions, it will fail to signal the proper countdown, affecting the starting process. The timer may need to be tested and replaced if faulty.
- Wiring or Connection Issues
Damaged or corroded wiring can prevent the glow plug system from receiving the necessary electrical signals. Poor connections at the relay or timer can also disrupt the countdown and glow plug operation.
- Defective Glow Plugs
If the glow plugs themselves are faulty, they may not heat up properly, making it difficult to start the engine, especially in cold temperatures. Testing the glow plugs for continuity can help determine if they are still functional.
- Blown Fuse or Circuit Issue
A blown fuse or issue with the fuse panel could prevent power from reaching the glow plugs. Checking the fuses related to the glow plug system is essential to ensuring that power is supplied correctly.
- Check the Glow Plug Relay
Inspect the glow plug relay for proper operation. Use a multimeter to test the relay for continuity and ensure that it is engaging when the ignition is turned on. If the relay is faulty, replace it with a new one.
- Test the Glow Plug Timer
The glow plug timer should be checked to ensure it is working correctly. If the countdown timer does not initiate when the ignition is turned on, the timer may need to be replaced. Check for electrical continuity in the timer circuit as well.
- Inspect Wiring and Connections
Look for any signs of damaged or corroded wiring in the glow plug system. Clean or replace any poor connections and ensure that all components are receiving proper power.
- Test the Glow Plugs
Check each glow plug for proper function by testing its resistance. If any glow plug does not show continuity or is damaged, it will need to be replaced.
- Check the Fuse Panel
Inspect the fuses related to the glow plug circuit. A blown fuse should be replaced with a new one, and the wiring should be checked for any shorts or breaks.
The issue of the glow plugs not working correctly and the absence of a countdown timer on a 1998 Bobcat 753 F Boss skid steer can be caused by a variety of factors, including faulty relays, timer malfunctions, wiring issues, or defective glow plugs. By systematically checking each component, users can identify and fix the issue, improving the starting performance of their machine.
