Tri State Hydraulics



The Young Powertech Planetary speed reducers have been designed with the most advanced technology and are manufactured in one of the most modern facility today dedicated
to maintain the highest possible quality and with over 40 years experience in this field we are confident to deliver a superior and trouble free product for many applications. This series has been designed to be superior in every aspect to the competitors with similar products. Our advanced design technical improvements, can assure you a longer life and better performance.

Available in a variety of motor connections and output option, this series will prove very flexible. When coupled with orbital motors, radial piston, and axial piston motors we can deliver a superior package at a lower cost.

We are better:
• 4 planet design for increase torque and life
• Hardened ring gear
• Larger bearings on output shaft
• Full complement bearing on planets

Ratio: 5.25:1 (Other ratios available upon request)

Max speed input: 3500 RPM

Torque ratings
Continuous Intermittent Peack
36.000 Lb-In 47.000 Lb-In 62.000 Lb-In
3.000 Lb-Ft 3.900 Lb-Ft 5.160 Lb-Ft
4.000 Nm 5.300 Nm 7.000 Nm


Technical Data Series 900

For the correct selection of a Young Powertech Inc Planetary reducer is necessary to take into consideration a number of factors. The correct use of the information in this catalog will help the customer to choose the best possible unit.

MOTOR-input power

The motor or device that will transmit the rotating motion to the speed reducer and the torque is a determinant factor in the life of the reducer especially if this cannot be closely controlled. Please consult our technical department REDUCTION To achieve the correct output speed or torque, a proper reduction related to the motor speed and torque and the application speed is necessary.


This is the maximum INTERMITTENT speed the unit can be run at without damaging gears and other components. For continuous duty or speed higher than those permitted, please contact Young Powertech Inc engineering depth


The efficiency of a planetary reducer is very high. The average efficiency if 98% per stage. Only when in very high speed or with the use of bevel gear the efficiency drops a little.


This is the highest torque according to ISO standard 6336. This value corresponds to and “Unlimited” gear life taking into consideration the bending and surface stresses of the teeth. When selecting the reducer, this value is found in each reducer pages and rated depending on the input speed. For different life at different condition, please refer to diagram on page page 9 Table 3


This is the maximum torque the reducer can transmit for a limited period of time without causing damages to internal components. This value MUST be considered as the MAXIMUM output torque during starting, reversing or working time. It cannot be considered as CONTINUOUS working torque. This value must also be carefully evaluated in application with starts, stops and reversing actions

Technical Data


This is the maximum power the reducer can transmit continuously without damages to the components in normal operating condition and ambient temperature without external cooling system. In this condition oil temperature should not exceed 90 degrees without external cooling. These conditions are: Input speed 1500 RPM; Ambient temperature 20C; Oil ISO VG 150; mounting position Horizontal; free air flow around unit. If the application required power is higher than the reducer Thermal Rating an external cooling system must be installed. If ambient temperature, input speed and torque output varies from the standard, a “CORRECTION” factor must be used to calculate the proper cooling requirements. Please see table 4 page 10.


Normal operating temperature should be between -20 to +90. Other working temperature is possible with special lubricants and seals. Please refer to Young Powertech Inc Engineering
deptm. for approval.

To insure proper reducer selection for a given application a number of factors need to be taken into consideration. The Torque rating T ISO has been calculated using the ISO DP 6336. This “torque” is based on an “unlimited” life (cycles) of the weakest part of the reducer. T. cont. is the “transmitted torque” on a continuous basis that guaranty a life of “hours” at a given output speed RPM n2, This is given in each individual reducer and ratio based on 5000 hours at different input speed. Other life calculation can be achieved by using the “Life Calculation Diagram Table 3 Page 9”.


1 - Input Speed
2 - Input Torque
3 - Type of input
4 - Input HP
5 - Ratio
6 - Service factor
7 - Safety factor based on F.E.M. requirement
8 - Thermal capacity
9 - Ambient temperature
10 - Number of start - stop - reversal

With the above data, it will be easy to choose the best possible reducer configuration. Young Powertech Inc engineers would be happy to select the proper unit. Please fill in the “Application data sheet” in the catalog or on-line for a quick response. To choose the proper output selection to meet application requirement, please use the following factors.
1 - Output torque
2 - Radial load
3 - Distance from mounting flange to center of load
4 - Diameter of Pinion, sprocket,
5 - Output speed RPM
6 - Life required Number of cycles expected

Reducers Selection
Output Selection

In any mechanical transmission, the selection of the correct planetary reducer is of the out most importance. Every component is subjected to variable stresses, load, speed and working cycles and the following information is necessary for such selection.
input Mover
1. Tip of the prime mover. Hydraulics, electric, mechanical etc.
2. Power of prime mover
3. Speed of the input mover
4. Torque input

Driven equipment

1. Power required by the equipment
2. Speed required
3. Type of operation
4. Working cycle

White the above information, the following data will become available

1. Reduction ratio required
2. Actual working torque and speed
3. Actual loads on input and output shafts

Now we have to check if the reducer chosen can accept the required loads and speed

1. Input and output speed
2. Actual working torque
3. Loads on input and output shafts
4. Horsepower to be transmitted
5. Ambient temperature