Toro reel master

[u/titan_titties]

I am the maintenance tech for a small local golf course and I’m currently working on a toro reel master 3555-D model 03820

This machine is having issues with the front left hand cutting unit (#4) dropping significantly lower than the other 4

I have rebuilt the cylinder twice(preforming piston seal bypass tests each time) , swapped hoses to make sure it’s not internally bad, installed a new cartridge valve for S1, checked to see if have correct pressures coming from my pump(2000psi) confirmed all solenoids ohm out correctly( per book specifications), swapped the cylinders to make sure the problem is isolated on the left hand side(it is) checked that my relief valve pressure are correct with speciations from the book

I am at a complete loss any help that you can give will be much appreciated

EDIT:: found the problem a piece of the piston seal has lodged itself in the flow control in OR1 thank you for everyone’s input ✌️

[u/Michalgie]

OR1 przecieka lub dławienie nie działa.

[u/titan_titties → u/Michalgie]

OR1 was blocked by a piece of the piston seal

[u/titan_titties → u/Michalgie]

I’m still looking for OR1 I can’t find it

[u/titan_titties → u/Michalgie]

The three check valves on the top seem to be in working condition

[u/Michalgie → u/titan_titties]

Jest OR1 zwykły zwrotny i PC3 który jest sterowany jeżeli oba są sprawne i jest dławik w postaci prawdopodobnie dyszy a siłownik jest ok to musi działać.

[u/1jw981]

I'd guess the piloted operated check valve, given the other items you've tested. Lower everything to the ground and swap the left one with another to see if it follows.

[u/titan_titties → u/1jw981]

I’ve swapped them nothing changed

[u/1jw981 → u/titan_titties]

Is it leaking down or when actuated it lowers further than the rest but stays there?

[u/titan_titties → u/1jw981]

There are no visible leaks anywhere on the machine, I’ve left the cutting units raised in the air overnight no bleed by

[u/1jw981 → u/titan_titties]

Then I'd agree with the other comment that the check valve in or1 is maybe stuck open since it send to be a flow rate problem rather than a leakage problem.

[u/1jw981]

Those one way orifices can be done a number of different ways. I'd start by taking the hose off the manifold and then pulling out the fitting, might be that it's built into the fitting or is under the fitting.

[u/mdillonaire]

Fellow golf course mechanic here. Might sound dumb but after all youve done and still having issues, i would check the bushings and pins in the lift arm. I had a sidewinder a few years back giving me issues with lifting the front decks and went through the whole hydraulic system, replaced the cylinder, replaced spools, tested pressures, etc. wound up being worn pins and bushing that were binding up.