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pump gear fluid
- Thread starter yeahyo
- Start date
tool_king
Senior Member
80w90will be ok .Also depends on temp here is oil chart 
wornout wrench
Senior Member
The pump drive doesnt hold very much oil.
Spend the extra buck and buy synthetic gear oil.
If the oil coming out is that nasty brown stuff, you might want to change the oil, run for a day and do it again to flush it out.
Keep an eye on it and if it starts to look discolored change it.
I don't remember what the service schedule is for the pump drive, we changed the oil every 500 hours on our EX400's.
Spend the extra buck and buy synthetic gear oil.
If the oil coming out is that nasty brown stuff, you might want to change the oil, run for a day and do it again to flush it out.
Keep an eye on it and if it starts to look discolored change it.
I don't remember what the service schedule is for the pump drive, we changed the oil every 500 hours on our EX400's.
Nige
Senior Member
If the oil that comes out looks really skanky then throw some diesel in there and then run the engine at low idle for a few minutes without using any hydraulic functions. Keep draining and flushing with diesel until what you drain runs clear. At that point leave the box to drain for at least 30 minutes while you have a coffee, lunch, cigarette, or whatever. Then come back and fill to level with the correct oil.
This may not work for your machine but we replaced the EP80W-90 oil in our Hitachi pump drive boxes with an SAE50 TO-4 oil and saw an immediate drastic improvement in oil condition as measured by oil analysis. Also our wear rates dropped way down. Despite the fact the oils appear to be very different the viscosity is as near as damnit the same. We ended up replacing the EP 80W-90 with TO-4 SAE50 in pump drives, swing boxes, and final drives.
This may not work for your machine but we replaced the EP80W-90 oil in our Hitachi pump drive boxes with an SAE50 TO-4 oil and saw an immediate drastic improvement in oil condition as measured by oil analysis. Also our wear rates dropped way down. Despite the fact the oils appear to be very different the viscosity is as near as damnit the same. We ended up replacing the EP 80W-90 with TO-4 SAE50 in pump drives, swing boxes, and final drives.
Deeretracks
Senior Member
I've been running 15w-40 in all our ZX Hitachi's for years. Even switched to Old EX700 over, it didn't get nearly as nasty after switching.
Nige
Senior Member
We tried that on our machines but it didn't give nearly as good results as SAE50 TO-4. Either option was better than EP oil though.