Case 150-190, T90, 2310, 2510, 2712 Compact Tractors Service Manual (incl. Wiring)

Check the carburetor for varnish buildup and debris in the main jet. Disassemble per page 127, inspect the needle valve and float for wear, then reassemble. For 150-190 and T90 models, set the high speed screw approximately two turns out from seated, then adjust idle mixture counter-clockwise approximately 1-1/4 turns from closed position. Test under load before returning to service.

Test system pressure at the pump outlet first; then check control valve leakage. If leakage exceeds 1/2 GPM, inspect the relief valve setting before condemning the control valve body. Adjust the relief valve by turning the adjusting screw no more than one half turn at a time, each half turn changes pressure approximately 100 PSI; alternatively remove shims, each shim removes approximately 200 PSI. See the full pressure and flow check procedure starting on page 152.

Inspect the cooling fins on the cylinder head for packed debris and clean with compressed air. Check the starter-generator drive belt: depress it between pulleys with finger pressure, it should deflect exactly 1/4". A loose belt slips and reduces cooling airflow. Verify the engine oil level and condition; low oil accelerates heat buildup. If overheating continues, check coolant passages and the shroud for missing or damaged sections that short-circuit airflow.

Inspect the battery terminals for corrosion and check specific gravity. Verify the starter-generator belt deflects 1/4" under finger pressure between pulleys — a loose belt causes slow cranking and low charging voltage. Check ignition contact points, timing, and spark plug condition per the electrical diagnostics starting on page 16. Torque spark plugs to 27 Ft. Lbs. on K241 and K301 engines after any plug service.

Inspect the starter-generator belt first: correct deflection is 1/4" under finger pressure between pulleys; a worn or loose belt causes undercharging. Check the voltage regulator output and verify all ground connections at the frame and battery terminals are clean and tight. Trace the wiring against the diagram on page 28 to locate any chafed insulation or broken leads. Replace the regulator if charging voltage falls outside spec after belt and connection corrections.

Drain the transmission and inspect the oil for metal particles — any shiny debris means internal gear or shift fork wear. Remove the transmission per the procedure starting on page 187, then disassemble and inspect shift fork engagement grooves and detent balls for wear. Check all bearing races for pitting. Reassemble with fresh oil to the correct fill level per the specifications section before reinstalling.