What is a PRM gearbox?
Built for reliability and durability all PRM hydraulic gearboxes feature a manual ‘get you home’ mechanical lock. This feature allows you to maintain the clutch in the engaged position so that the vessel can be bought safely home in the unlikely event of hydraulic failure.
What oil goes in a PRM gearbox?
15W40 mineral oil
Oil. Hydraulic gearboxes, we recommend 15W40 mineral oil (not synthetic) for typical use. For extreme temperatures see owners handbook. Always check the oil level with the dipstick screwed down.
How does a marine hydraulic gearbox work?
A mechanical forward-neutral-astern gearbox in which the shifts are made by a hydraulic link from the hand lever. A small boat may have a direct-acting lever like a motor car, but a hydraulic link allows the control lever to be fitted at some more remote point in a larger boat.
How do I know if I have a PRM gearbox?
A: The serial plate on the top of the gearbox will say what model of PRM gearbox you have. The first line will have the serial number and the second line is the PRM model number and ratio. An example of modern plates will say “280D2. 5” which means that the gearbox is a PRM280 with a drop centre and a 2.5:1 ratio.
What oil goes in a boat gearbox?
Description Detxron/Mercon Transmission Fluid.
What causes a boat transmission to slip?
Dirty oil causes severe problems for your boat transmission. You could experience clogged filters and particulate matter getting into the clutch. The clutch plate may slip and disengage. Regular transmission oil changes can prevent these issues.
Do boats have manual transmissions?
The transmission in a boat has nothing to do with automatic or manual transmissions in automobiles. In fact, mechanics generally refer to a marine transmission as a marine gear, underlying how different they really are.
What Prop Slip feels like?
But, when RPM is increased, the engine revs with little or no boat acceleration because the prop begins to spin. A spun hub feels like a loss of power with excessive RPM. You will likely feel the prop slipping at high RPM.
Can a boat transmission slip?
Even with proper maintenance, marine transmissions occasionally fail. But they often slip, shift harder than usual, or make uncharacteristic noises well beforehand.
Why do boat engines not have transmissions?
Boats do not have transmissions like cars because adding transmissions to a boat engine will cause undesired complexity, creating more problems such as cavitation, increasing the boat’s drag & fuel consumption, etc., for a small increase in speed. That’s why boats don’t have gears like cars do.
What causes a spun prop?
A spun propeller means that the prop hub has spun inside the propeller. Once the hub spins inside of the propeller, the propeller will spin freely and not along with the hub. A hub can spin inside of a prop due to damage to the hub, damage to the inside diameter of the propeller or incorrect propeller installation.
What causes prop blowout?
Blowout occurs when something causes air/water mixture in the region of the propeller to become sufficiently disturbed that the propeller cannot continue working in “clean” water, but is rather, trying to work through a very soft or light mixture (or a relative vacuum).
What kind of gearbox does the PRM 60 take?
A: Our PRM 60, 80, 90, 120 and 125 gearboxes are mechanical gearboxes. All our other marine gearbox models are hydraulic gearboxes. Q: What Oil does my gearbox take? A: A mechanical gearbox (PRM 60, 80, 90, 120 or 125) must use automatic transmission fluid (ATF) Dextron II or III
Are your PRM Marine gearboxes no longer in production?
Over the years the PRM marine gearbox range has been improved and the model numbers have been changed. If you have an older PRM model still in service please refer to the appropriate new model number for more information. The table below shows the range of old PRM gearboxes that are no longer in production.
What kind of oil do you put in a PRM gearbox?
Speaking of which, don’t forget to fill up with oil again before you try the thing out. Notwithstanding that the PRM 100 and 140 et al are described as hydraulically operated gearboxes they use ordinary 15w40 engine oil (mineral, not synthetic).
How do I download the manual for a new hydraulic gearbox?
To download the manual, click on the model number. Items marked ** are a direct replacement for the old model with the same external dimensions. Hydraulic gearboxes, we recommend 15W40 mineral oil (not synthetic) for typical use. For extreme temperatures see owners handbook.