User Manual

A MACHINE MOVES IN ONE DIRECTION ONLY

• Inspect transmission control linkage for wear or damage. See Section 50.

• 316 and 318; Test for debris in check valves: GO TO ‘

• Inspect check valves for damaged valve seat, seals or stuck check ball. See Section 50.

• Inspect internal transmission components for wear or damage. See Section 50.

B MACHINE WILL NOT MOVE IN EITHER DIRECTION

• Inspect transmission control linkage for wear or damage. See Section 50.

• Inspect transmission drive shaft and crankshaft pulley for loose cap screws or damage.

• Check for improper charge pump installation (180 degrees off). See Section 50.

• Test charge pump pressure: GO TO Æ

• Inspect check valves for damaged valve seat, seals or stuck check ball. See Section 50.

• Inspect internal rotating group for scoring and wear (slippers, pistons and cylinder block, valve plate and

cylinder block). If internal damage is found, check for missing welch plug: GO TO Ò

C TRANSMISSION OPERATION HAS ERRATIC OR LOW POWER OR SPEED WILL

NOT INCREASE

• Inspect brakes and brake linkage for wear or damage. See Section 60.

• Inspect transmission control linkage for wear or damage. See Section 50.

• Check for improper charge pump installation (180 degrees off). See Section 50.

• Test charge pump pressure: GO TO Æ

• Inspect check valves for damaged valve seat, seals or stuck check ball. See Section 50.

• Inspect internal rotating group for scoring and wear (slippers, pistons and cylinder block, valve plate and

cylinder block). If internal damage is found, check for missing welch plug: GO TO Ò

• Check for dirt accumulation on transmission causing transmission oil to overheat: GO TO Õ

• Check for high draft loads causing transmission oil to overheat: GO TO Õ

MX,159025015,3 -19-20APR95

MX,159025015,4 -19-20APR95

MX,159025015,5 -19-20APR95

Diagnosis, Tests and Adjustments/Troubleshooting Guide

TM1590 (17MAY95) 250-15-2 316, 318 & 420 Lawn and Garden Tractors

020895

250