Water in the water box makes sense but the mechanic I bought my pump from says hydraulic fluid is a better choice any thoughts

what happens when your mud cups start to wear out and you leak hydraulic oil into the concrete. OR what happens when you contaminate the waterbox with cream from the concrete, then where do you dispose of the oil?

there is soilable oil its  what came in my 43 meter  when we bought new from putz but after that ran out we started with water every company i know of uses water

Like I said.. Some pumps have this system where oil get sprayed in to the water box. So I guess its ok to just ad a bit of oil to the waterbox.. But filling it all up with just oil sounds crazy to me.

It is a "FLUSHING" WATER BOX for cooling the chrome pumping rods which cools the oil in the system... Over long pours this should be emptied and refilled with clean cold water. Central lubrication is a whole other system.

NOT oil lubrication box....

Your mechanic is wrong thinking in this application.

I am pretty sure most putzmeisters have it set up where it drips a little hyro in water box every so often. 

If the P50 is a Transcrete Trojan, it should be running hydraulic oil in the flush box. Transcrete pumps have poly' piston cups running on hard chrome liners. NEVER water unless as a temp' measure until oil can be sourced. 

Hey thanks that is solid advice from down under Ya its a Trojan I pushed 185 meters thru her the first day then another 165 the next day That being the first two days ive owned it  got a lucky break on the contract and she ran sweet all day  Thanks again

Rev, is that the P50 out of Arizona?

Yes indeed my p50 was owned by a pool company in Arizona

Do you know that pump like i said iv had it 1 week now and as luck would have it ive done four jobs and moved

just over 400 meters with it so far so good but i thank that guy from Australia for fillin me in on the hard cups and the need for hydraulic oil instead of water

Hey that was you thanks for the advice any thing else i should know?

On a Putz, the water box stands for 30% of the cooling of the hydraulics.

In 24 hours of pumping it can leak upto 1 litres of oil into the water box.