As standard the units are supplied with the shaft 1 or sometimes referred to as A as the input. It is also the shaft, which is housed, in an extended housing on ratios above 1.5:1 on the range N and all ratios on the PowerGear range. When using a 1:1 ratio gearbox it does not matter which shaft is used as the input as the speed will remain constant. However it is important to ensure that the correct shaft is used on higher ratios other wise the unit will end up increasing the speed.

All units can be used as speed increasers, by inputting on the output side of the gearbox, however it is important to check that the unit can handle the power and speed. When using as an increaser it is usually the input speed that is important, do not exceed the catalogue recommended maximum speed. Special units are available where the pinion can be put on the through shaft so that two outputs increase the speed, please request details on this.

When looking at the bevel gearbox shaft arrangement diagrams, the gearboxes are shown in plan view, but the actual rotational arrows are representative of the output shaft rotations viewed from the end of the shaft looking directly at it. A good visualisation of the gear arrangement can also be seen on the 3D CAD models for the Range-N bevel gearboxes configurable online. You can view the model with a transparent housing just to check gear orientation.

There are safety margins built into the figures, but the tabulated figures should not be exceeded, so that the units work for efficiently and correctly for their intended life time.

It is very tempting to tap couplings onto the shafts using a hide mallet, but this is a method which is not recommend, as a sharp blow to the shaft end can damage the bearings. The preferred method of fitting is to use the tapped hole in the end of the shaft and a bar with a hole drilled through it. Put the correct size screw through the hole and wind the coupling on.

Some of the units in the ranges are supplied with a vent, others are not.
The Range N & the Range PowerGear up to and including the P140 / X140 do not have breathers fitted as standard. All other units are either supplied with breathers pre-fitted, or will be supplied with the unit to be fitted after oil fill. If the unit is to run at very high speeds, then we would suggest fitting a breather, please consult us if you intend to run a unit extremely fast.

Range-P is supplied filled with oil and sealed for life.

Range-N is supplied dry (no lubricant).

Range-PowerGear up to and including the P140/X140 are shipped pre-filled with oil.

All other units will require filling with oil prior to installation. Note - For low speed applications (250 rpm input speed and below) gearboxes may be recommended to have semi-fluid or grease lubrication. Consult Power Jacks for advice.

This depends on how often the unit is run and the type of oil that has been supplied with the unit (if pre-filled).

Range P units are sealed for life and require no maintenance.

Range-PowerGear up to and including the P140/X140 are sealed for life.

For all other units we recommend changing the oil every six months or 2,500 operating hours.

We recommend filling the units with grease or semi-fluid grease if the units are operating at speeds of 250rpm or below.

The case temperature must not exceed 80ºC.

We can adapt a unit to your specification, but only from the Range N, the design of these units are suited to adaptability.

The maximum pinion speed is based upon a pitch line velocity of 762M/min. (2500ft./min.)

The units efficiency ranges from 95 – 98%

It is known that the noise and temperature levels do drop when the units are under load, this is due to the bearings and gears working rather than running idle.

The range P units are sealed for life and not suited for economic repair. They should be replaced instead.The range N, PowerGear & BA can be repaired or spares fitted, although it is worth noting that if all internal components need replacing then it would be cheaper to purchase new units. If units need repairing we would recommend returning them to the factory, where they can be rebuilt with the correct backlash and alignment.

When disposing of gearboxes and lubricant please do so in an environmentally responsible manner.