How to Remove Hydraulic Pump for Yanmar ViO45 ViO55 Excavator

It is necessary to remove pump when you perform service operation for Yanmar machine.Here is the illustration on how to remove hydraulic pump for Yanmar ViO45-5 and ViO55-5 excavator.

 

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Procedures:

(1) Swing the upperstructure so that the drain plug 2 of hydraulic oil reservoir 1 can position in the middle of the tracks. Then lower the bucket to the ground and stop the engine.

(2) Open the engine hood rear cover 3 and remove it.
(3) Disconnect the battery negative cable 5 from the battery 4.
(4) Loosen three cap screws 6 to remove the side cover 7.
(5) Remove the bottom cover 8 and put an oil container under the drain plug 2 of the hydraulic oil reservoir.
(6) Remove the drain plug 2 to drain hydraulic oil.
(Q’ty: 10 Gal(38L))
At this time, loosening or removing the filler cap 9 make oil draining easier.

 

(7) Disconnect hydraulic hoses from the hydraulic pump.
a. Suction
b. P1
c. P2
d. P3
e. B1
f. B2
g. A
h. P(P4)
i. C1
j. C2
Note :
• Mark each hose to reinstall on the original position.
• Plug each hose end and fittings on the control valve against dust.

(8) Remove the couplers 6 of the wires for the cut-off valve,the high-speed travel and the quick coupler.
(9) Remove the installation bolts 7 from the flywheel cover to remove the hydraulic pump.
Note :
Put rope onto the hydraulic pump to remove it using a lifting device.Yanmar SmartAssist 2023

More Yanmar machine repair case,please refer to Yanmar Trouble Repair