Komatsu PC4000, Assembly Procedure

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Ass Ass emb emb ly ly Pro Proced ced ur ur e PC4000 e PC4000
PC4000Asrev05 PC4000Asrev05
Edition 08/2005 Edition 08/2005
65 65
3. 3.17 17 Bleed Bleed air air fro fro m m all all hydr hydr aulic aulic pump pump s s and and
check t check t he Oil L he Oil L evel in all evel in all four four Ma Main in Pump Hous Pump Hous ing ing s (Z2 s (Z216 1693 93; Z225 ; Z22513 13))
Legend for Legend for ill ill ust ust . Z 21 . Z 2169 693 3
I I – – IV IV Main Main hydraulic hydraulic pumps pumps (swash (swash plate plate type) type)
(1) (1) Axial Axial piston piston pump pump for for hydraulic hydraulic oil oil cooler cooler fan fan drive drive
(2) (2) Axial Axial piston piston pump pump for for engine engine coolant coolant radiator radiator fan fan drive drive
(3) (3) Piggy-back Piggy-back gear gear pump pump for for pump pump regulation regulation and and pilot pilot oil oil circuit circuit
(4) (4) Piggy-back Piggy-back gear gear pump pump for for PTO PTO gear gear lubricati lubrication on sys-tem sys-tem
(14) (14) Oil Oil level level and and filler filler plug plug of of main main pump pump housing housing
(15) (15) Port Port of of leakage leakage oil oil return return line line
Bleeding air Bleeding air fro fro m pum m pum ps (1 - 4 ps (1 - 4) a ) and main nd main pump pump s (I - s (I - IV IV))
Bleeding air from the hydraulic pumps and complete filling of the suction oil Bleeding air from the hydraulic pumps and complete filling of the suction oil
reservoir and the suction lines is essential, to prevent damages caused by air reservoir and the suction lines is essential, to prevent damages caused by air
in the in the suction system (cavitation).Pr suction system (cavitation).Proceed as oceed as follows: follows:
(1) (1) Open Open vent vent plug plug on on top top of of pumps pumps (1 (1 and and 2). 2). Close Close the the vent vent plugs plugs as as
soon as bubble-free oil flows out. soon as bubble-free oil flows out.
(2) (2) Open Open vent vent plug plug (13), (13), illust. illust. Z22513 Z22513 on on the the suction suction port port of of gear gear
pumps (3 and 4) and wait until bubble-free oil flows pumps (3 and 4) and wait until bubble-free oil flows out. Then out. Then
tighten vent plug (13). tighten vent plug (13).
(3) (3) Open Open vent vent plug plug (13) (13) on on the the pump pump suction suction port port of of all all four four main main
pumps. As soon as bubble free oil flows out tighten vent plug(13). pumps. As soon as bubble free oil flows out tighten vent plug(13).
Check oil level in m Check oil level in m ain pump h ain pump h ousi ousi ngs (I - ngs (I - IV IV))
(1) (1) Remove Remove level level and and filler filler plug plug (14), (14), illust. illust. Z Z 21693. 21693. The The oil oil level level in in the the
pump housing must reach the lower edge of the opening. pump housing must reach the lower edge of the opening.
(2) (2) If If necessary necessary add add hydraulic hydraulic oil oil up up to to the the lower lower edge edge of of the the filler filler
opening. opening.
(3) (3) Insert Insert level level and and filler filler plug plug (14) (14) and and tighten tighten securely. securely.
 
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Ma Make sure the main pump ho ke sure the main pump ho usings usings are correctly filled, are correctly filled,
otherwise the pump otherwise the pump drive shaft b drive shaft b ea earings rings could could be dama be damaged ged
due to lack of lubric due to lack of lubric ation. ation.
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Che Check h ck h ydraulic ydraulic oil oil leve level. l.
• •
Check the whole hydrauli Check the whole hydrauli c syst c syst em for leakage em for leakages. s.