. SAFETY PRECAUTIONS FOR MAINTENANCE SAFETY PRECAUTIONS FOR MAINTENANCE brake switch (3) to the the parking brake, then put blocks under of the tires. 2 - 33 After stopping the engi ne, operate wor k equipment control lever (1) 2 to 3 time s fully t o the RAISE a nd LOWER positions to release the pressure i nside the hydraulic circuit, hen set work equipment lock lever ( 2) to the LOCK position. Turn parking ON position to the front an rear Lock the front and rear frames with frame lock bar (4).