Manual Volvo Tamd 74
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I have a powerboat with 2 Volvo TAMD 74 EDC coupled to ZF Marine ZF280A gearboxes. The issue I have is that the Starboard gearbox takes between 5 to 7 seconds to engage into forward or reverse gear after shifting the helm controls. This issue started around 6 months ago when I notice it had a delay of a second or so longer than the port gearbox. This has steadily got worse and now being a 5 to 7 second delay. Interestingly, It doesn’t have the delay dropping out of gear when the control is shifted back into neutral. The delay time also tends to be shorter if either forward or reverse is selected once again within a second or so after returning to controls to neutral however, if left in neutral for more than 5 seconds, the delay returns to around 5 to 7 seconds again. I have changed the gearbox oil with the correct grade and type according to the manual and cleaned the metal screen filter and magnet, this had a few tiny almost insignificant metal shards but was 95% clear, none of this has made any difference.
It has plenty of oil in the box and I checked level on the oil dipstick within 2 minutes of shutting engine down so the oil cooler hadn’t drained back giving a false “overfilled” reading (as per the ZF manual). The gearbox has the electronic shift solenoids, the forward and reverse solenoids both make a “click” as soon as the helm controls are moved so there seems no delay with the signal from the helm controls. Could these electronic control solenoids be sticking? Moving slowly? Could the oil pump be failing to supply enough pressure? (this boat is not fitted with gearbox oil pressure gauges) Has anyone experienced this problem on here before and found the cause? I would appreciate any suggestions as to where/what I should I be checking next?
Thank you in advance. Could be gearbox inter cooler has a leak and releasing oil pressure needed to engage gearbox drive or actuators sticking / grabbing and slowly opening to the point of enough pressure engagement. Twin engines are there to exchange parts before purchase of replacements.If the cooler was leaking you would see oil in the cooling water and the box would be empty in no time at all, so I’d dismiss that theory. The ZF 280 wasn’t a great gearbox. Volvo specked it for the first D9 engines but sadly they totally miscalculated the very low down torque of the D9 matched to a heavy boat like the Broom 450 was a recipe for disaster, not too long after owners were being caught out with a box full of stripped teeth and heart stopping moments at sea on one engine praying the other would go the same way.
Volvo Tamd 74 Maintenance Schedule
The ZF 280 was right on it’s calculated limit for HP but no one calculated the torque Andy it’s torque that does the damage. The twin disc fitted to the same engin eisnt much better keeping MIT in business.
I’d say that the pressure is dropping and has caused the clutch plates to alter shape or buckle allowing too big a gap for the clutch piston to compress the plates. There are plugs on the valve block where you can tap in a gauge and measure the pack pressure under load this will tell you what’s happening. Hi, First of all, thank you everyone for your help and interest. I have bought an oil pressure test kit from eBay last week (measures up to 500psi) and went to the boat to check these pressures. From what I understand, there are 2 places to take a useful reading, one is on the back of the oil pump that should be a stable high reading, and the other is on the gear selector control unit located on the top the gearbox. There is a hex grub screw between the two control solenoids where a meter can be connected and then able to read the oil pressure to the clutches.
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(If I am misunderstanding anything above, please feel free to correct me). Unfortunately the hex grub screw in the control unit was so tight that as I was trying to carefully release this with gentle use of an impact driver, it just rounded the hex screw. I guess I will have to remove the entire gear selector control unit now and attempt to somehow remove this grub screw. I will at least first take a reading from the oil pump to see if that is generating the correct pressure (assuming that hex screw is more obliging). Once again, thanks for the interest and suggestions, I do appreciate as I have limited knowledge with a gearbox leaving me slightly anxious going forward. The solenoids on both Port & Starboard gearboxes make a 'click' sound within a second of shifting the helm controls, so I am assuming that there is no additional delay programed into the helm throttle controls however, I will reread the manuals I have.