MECHANICAL CHECKS
Prior to checking any part of the system from a hydraulic 2. Check shift levers and rods for binding or restrictions in
standpoint, the following mechanical checks should be travel that would prevent full engagement. Shift levers by
hand at control valve, if full engagement cannot be
made:
obtained, difficulty may be in control cover and valve
1. A check should be made to be sure all control lever assembly.
linkage is properly connected and adjusted at all
connecting points.
HYDRAULIC CHECKS
Before checking on the torque converter, transmission, and Engage shift levers in forward and high speed and apply
allied hydraulic system for pressures and rate of oil flow, it brakes. Accelerate engine half to three-quarter throttle.
is essential that the following preliminary checks be made.
Hold stall until desired converter outlet temperature is
1. Check oil level in transmission. This should be done reached. CAUTION: FULL THROTTLE STALL SPEEDS
with oil temperatures of 180 to 200 F. [82, 2-93, 3 C]. DO FOR AN EXCESSIVE LENGTH OF TIME WILL
NOT ATTEMPT THESE CHECKS WITH COLD OIL. To OVERHEAT THE CONVERTER.
bring the oil temperature to this specification it is necessary
to either work the machine or "stall" out the converter.
Where the former means is impractical, the latter means
should be employed as follows:
LOW CLUTCH PRESSURE
Cause
Remedy
1.
Fill to proper level.
1.
Low oil level.
2.
Clean valve spool and housing.
2.
Clutch pressure regulating valve spool stuck open.
3.
Replace pump.
3.
Faulty charging pump.
4.
Replace sealing rings.
4.
Broken or worn clutch shaft or piston sealing rings.
5.
Clean bleed valves thoroughly.
5.
Clutch piston bleed valve stuck open.
LOW CONVERTER CHARGING PUMP OUTPUT
1. Fill to proper level.
1.
Low oil level.
2. Clean suction screen.
2.
Suction screen plugged.
3. Tighten all connections or replace hose if necessary.
3.
Air leaks at pump intake hose and connections or
4. Replace pump.
collapsed hose. (R-28000 only)
4.
Defective oil pump.
OVERHEATING
1. Remove, disassemble, and -rebuild converter
1.
Worn oil sealing rings.
assembly.
2.
Worn oil pump.
2. Replace.
3.
Low oil level.
3. Fill to proper level.
4.
Pump suction line taking air. (R-28000 only)
4. Check oil line connections and tighten securely.
NOISY CONVERTER
1. Replace.
1. Worn coupling gears.
2. Replace.
2. Worn oil pump.
3. A complete disassembly will be necessary to determine
3. Worn or damaged bearings.
what bearing is faulty.
LACK OF POWER
1. Low engine RPM at converter stall.
1. Tune engine check governor.
2. See "Overheating" and make same checks.
2. Make corrections as explained in "Over-Heating."
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