MAINTENANCE EVERY 250 OPERATING HOURS DIFFERENTIAL 1. Unscrew the locking screw (2) of the drill hole at the front ax- le. Check the oil level as described under points 3 through 5 in section "Planet gear". 2. Unscrew the locking screw (2) of the drill hole at the rear ax- le. Check the oil level as described under points 3 through 5 in section "Planet gear". 2 75_226 2 75_227 7-48