Shane T
Member
Pressure drops 200 psi when triggering. Assuming it is getting adequate water to the inlet side(which I'm sure it is), is this a valve or seal problem?
Cat 310 Pressure Drop
- Thread starter Shane T
- Start date
Cleanworks
Moderator
Check for debris in the unloader valve first.
Shane T
Member
I should add that there is also a hard pulsation on the pressure side.
Cleanworks
Moderator
That's exactly what was happening with my cat 3cp pump. Cleaned out the unloader and greased it and it came right back. Could also be your check valves.
Dolly Llama
Number 5
Shane T
Member
Possible, I recently had the pump out.
Mikey P
Administrator
On every tool at all pressures
Doug Clean
Member
Hi Shane..
If the pump ran dry you might need to put a seal kit in it.
I used the the Cat 290 pump for 18 years and had to change the piston seals twice in the first 3-4 years when I let it run dry.... then I bought a Hot kit for it and never changed the seals again.
33623 – Cat Seal Kit Hi Temp 310, 340, 350 Pumps
Check the inlet filter first
KevinD
Member
I had a cat pump that acted the same way. A sliver of a brass thread got stuck in one of the check valves keeping it open.
Shane T
Member
No air leaks
Pressure lose on all tools but the more flow the tools has the greater the lose.
Checked the valves today, no debris but some deterioration from cavitation. Had some new ones so I installed them. No change in operation. I'll pull the unloader tomorrow and check it. There is a very noticeable pulsation in the solution hose that is not normal for this unit.
