suss1173
Active Member
- Jul 11, 2013
- 411
- Boat Info
- 05 390 QSB 5.9,s
Past- 01- 340 -7.4 Horizon's. Pachanga 27- twin 350's, 94-300 twin 350's
- Engines
- Twin QSB 5.9’s
I am running our boat up the coast and experienced a temperature alarm on the Port ZF80 gearbox. We verified the alarm with an IR gun and the box is running at 270 when running @ 80 % load.
After pulling into port we verified a few things.
Water to hyd Oil Heat exchanger is clear and operating properly.
Looking at the hyd system pressure it seems to be running lower than Starboard motor.
Port 60psi idle in gear
Star 110psi idle in gear
Making the assumption the sol were not fully shifting the spool we swapped them with the good motor and no change.
We are down to either the hydraulic pump or ZF gearbox.
Would the hydraulic pump head be the only reason we would have lower pressure? Or is there something mechanically in the gearbox that would also cause this symptom. Our theory is the clutches are slipping since we are below full lock pressure. However the oil looked good and did not smell burnt after running for a while before realizing it wasn't a faulty temp sensor.
Any advise would be appreciated.
After pulling into port we verified a few things.
Water to hyd Oil Heat exchanger is clear and operating properly.
Looking at the hyd system pressure it seems to be running lower than Starboard motor.
Port 60psi idle in gear
Star 110psi idle in gear
Making the assumption the sol were not fully shifting the spool we swapped them with the good motor and no change.
We are down to either the hydraulic pump or ZF gearbox.
Would the hydraulic pump head be the only reason we would have lower pressure? Or is there something mechanically in the gearbox that would also cause this symptom. Our theory is the clutches are slipping since we are below full lock pressure. However the oil looked good and did not smell burnt after running for a while before realizing it wasn't a faulty temp sensor.
Any advise would be appreciated.