Yanmar 4LHA-HTP Operation Manual page 589

Chapter 7 Reduction and Reversing Gear
4. Disassembly
20. Remove output shaft assembly.
BEARING, GEAR and SEAL INSPECTION
21. Inspect all tapered roller bearings, the piston rings on the
input shaft and all gears for wear. If damage has been
found on the gearing of the intermediate or output shaft, it
is ALWAYS necessary to replace the complete shaft.
When gears on the input shaft have to be replaced, the
tapered roller bearings and needle bearings MUST BE
replaced as well.
22. Turn gears of input shaft to check correct operation of the
reversing clutch. If it is hard to turn the gears, the clutch is
probably damaged.
c
SEALS
23. Remove suction pipe seal as follows:
a - Seal
a. Bend tabs up away from screws.
a - Tabs
7-2-15
4LHA Serit