4–4 Checking Controls

NOTE: For AT 500R transmissions, the minimum size for primary cooler hose is No. 16 with a minimum ID of 0.875 inch (22.4 mm) and for auxiliary cooler hose is No. 8 with a minimum ID of 0.50 inch (12.7 mm).

• If the hydraulic system has been contaminated with debris, install an auxiliary filter between the cooler and transmission (in cooler-return line). Refer to

Paragraph 1–10 for filter recommendation and installation details. • Vacuum or air modulator line and/or hose — inspect for deterioration, bad connections, loose or missing clamps, or improper routing that causes kinks.

4–4. CHECKING CONTROLS

Inspect transmission control components on vehicle and correct any faulty conditions:

• Shift selector control — inadequate freedom of movement, frayed or kinked cables, lack of lubrication, worn rod ends or clevis pins, damaged threads, or improper routing. • Mechanical modulator control — inadequate freedom of movement, frayed or kinked cables, lack of lubrication, worn rod ends or clevis pins, damaged threads, or improper routing. • Parking brake control — cracks, bends, damaged threads, worn rod ends or clevis pins. • PTO control — damage, wear, improper operation, lack of lubrication, or improper routing. • Speedometer drive cable — wear, damage, kinks, lack of lubrication, improper routing, or incorrect drive torque. • Wiring and related electrical components, sensors, and switches — poor connections, frayed wiring, or other damage.