Trochoid Pump Components; Disassembly(Reverse The Procedure Below For Assembly); Servicing Points - Yanmar 3TNV Series Service Manual

5.2 Trochoid Pump Components

Trochoid pump (3TNV82A TNV88)

5.3 Disassembly(Reverse the procedure below for assembly)

1) Loosen the belt, and remove the radiator pulley, fan and V-belt. See 4.2.2. 2) in Chapter 4.
2) Remove the crankshaft pulley. See 4.3.2. 3) in Chapter 4.
3) Remove the gear case cover. See 4.3.2. 4) in Chapter 4.
4) Remove the lubricating oil pump assy from the gear case for 4TNV94/98/106. (5.4 Point 1)
Remove the lube oil cover from gear case cover for 3TNV82A-88. (5.4 Point 1)
5) Remove the pressure regulating valve from the lubricating oil pump body. (5.4 Point 2)

5.4 Servicing Points

Point 1
[Disassemble]
Check if the pump rotates smoothly and see that there is no play between the shaft and gear, and
inner rotor.
[Reassemble]
[NOTICE]
Always check if the pump rotates smoothly after installation on the gear case.
Running the engine when the pump rotation is heavy may cause the pump to be burnt.
1) 3TNV82A-88
Apply lube oil to rotor (outer/inner) insertion part.
Assemble the outer rotor so that the mark of the end face may become a cover side when
inserting it in the gear case.
Fasten a lube oil pump cover by the standard torque.
Tightening torque: 6.9 1.5N m (0.7 0.15kgf m)
When replacing the lube oil pump, replace the whole assy.
2) 4TNV94L/98/106
Apply lube oil to lube oil pump insertion part of gear case.
Install the outer rotor in the gear case so that the punch mark on the end face is seen.
When replacing the lube oil pump, replace the whole assy.
Point 2
[Disassemble-Reassemble]
Only wash the pressure regulating valve. Disassembly is unnecessary unless any abnormality in
operation is detected.
Trochoid pump (4TNV94L/98/106)
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5. Lubrication System