BorgWarner Kysor® K26RA and K22RA Fan Drives

1. Check the fan for missing, cracked, chipped, or damaged blades. Tighten loose components. Replace damaged fans if necessary.
2. Check for adequate clearance around the fan. The fan should be centered in the shroud to prevent contact between the fan and the shroud.
3. Check the fan belt for proper alignment and condition. If the belt is worn or frayed, replace the belt.
4. Verify the fan drive engagement. With the engine and ignition key switch off, apply at least 90 psi (620 kPa) to the clutch; the fan should rotate freely. Remove air pressure from the clutch and the fan should not rotate.
5. With the fan drive disengaged, check for air leaks at the front of the clutch and between the clutch and the drive hub. If an air leak is detected, the clutch seals and hub must be inspected for wear or damage. If necessary, the seals of the clutch can be replaced with a Kysor rebuild kit. If inspection of the hub indicates excessive wear, rebuild the hub using a hub rebuild kit from Kysor.
6. Any time the clutch is removed for repair or replacement, the pulley hub and bearings should be inspected for play, roughness, or damage. Hub bearing service kits are available from Kysor.
7. Check the lining with the System Alert Tool™. If the lining is worn, install the appropriate lining kit. A lining that is prematurely worn is caused by control air supply problems. Inspect and correct the vehicle control system before placing the vehicle back in service.
8. Check the air line entry and routing at the front or rear of the fan drive. Look for cracked, damaged, or improperly routed air lines. Make sure the connections are tight and that there are no air leaks.
9. Check the electrical connections at the solenoid valve, which is typically mounted to the frontwall. Check the exhaust port for restrictions. If a restriction is found, clear it.