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Guide to choosing the right PTO (gearbox side unit) for trucks and hydraulic equipment

Vehicles that use this Volvo PTO model:

VOLVO

FL 616 4X2, FL 7 4X2, F 10, F 12 FS 6X4, F 16, FH 12340, FH 12380, FH 12420, FH 16470, FH 16520, FH 16560, FH16610
FM 7290, FM 12460, FM 12500, FM 12380 8X4, FM 12420 8X4, N104X2, FM 12340, FM 12380, FM 12420, FM 10360, FM 10320, FM 7250,
N 12, FL 10, NL 12, FH 16, FH 12, FM 12, FL 616, FL 7, FM 7

Gearbox numbers that use this Volvo PTO model:

R 1000, R 1400, R 1700, R 1900, R 2000, R2400, RO 2400, SR 1000, SR 1400, SR 1700, SR 1900, SR 2000, SR 2400
VT 1708, VT 2009B, VT 2014, VT 2212, VT 2214, VT 2214B, VT 2514OD, VT 2514B, VT 2814B, VTO 2214B (OD), VTO 2514B (OD), VTO2814B

To connect the PTO to the main gearbox, a mounting port is designed on the PTO that is square-shaped and has four holes. These holes are used for bolting to the main gearbox, and through these bolts the PTO is firmly attached to the gearbox. This connection ensures that the PTO is properly mounted with high strength and that the produced power is transferred effectively. The design provides easy and safe installation and helps prevent oil leakage or damage to internal components.

This PTO is specifically connected to the rear of the gearbox. The design is such that the PTO mounting port (with four holes) is bolted to the rear of the main gearbox. This connection is made through bolts and holes, ensuring the PTO is firmly and securely fixed in place.

Required parts:

1. Internal gearbox shaft to transfer power to the PTO
2. Adapter between the gearbox and the PTO for proper installation and correct coupling of the PTO to the internal shaft and gearbox; to use common PTO models available in the market, adapters are used.

The gears inside the PTO must be designed to mesh with the gears of the main gearbox. This specific model is designed due to the need for precise gear engagement. The gears must have a specific form, size, and spacing to match the gearbox gears correctly. This precise design is essential to ensure optimal performance and effective power transfer. This Volvo PTO model has straight gears, which are located inside the PTO housing.

PTO units can be single-gear or two-gear. In the single-gear model, the gears are arranged in one row and are typically suitable for lighter systems with lower required power. This model takes up less space and is designed for general applications with lower loads.

Different PTO control models (manual, pneumatic, vacuum, and electric) are designed to match the specific needs of each system. These controls are responsible for regulating the transfer of power, torque, and rotational speed between the main gearbox and other system components. The goal is to prevent excessive load on system components, avoid part damage, and ensure smooth and effective power transmission. These controls enable equipment to maintain optimal performance under varying loads and working conditions. In Volvo S500 PTO units, the control type is pneumatic. This system is specifically designed to precisely regulate and manage power transmission to ensure correct and stable gearbox performance under different conditions.

The pump connection flange of this PTO is designed in ISO format, which makes installation easier and improves compatibility with different pump types. The ISO design ensures a firm and safe connection and guarantees optimal performance in transferring hydraulic power. Depending on the pump configuration, this connection can be done in three ways:

ISO pumps that connect directly to the PTO.

UNI pumps that connect using an adapter.

By installing a cardan adapter that connects to a driveshaft (cardan).

The PTO output rotation direction depends on the gear type and gearbox design, which can be single-row or double-row.

Single-gear gearboxes: In these gearboxes, the output rotation direction is usually opposite to the input direction. In other words, if the gearbox input rotates clockwise, the output is typically counterclockwise, and vice versa.

Two-gear gearboxes: In these gearboxes, the number of gear rows can affect power transfer and therefore the output rotation direction. Typically, in double-row gearboxes, more complex changes occur in the output rotation direction, and the output direction may vary depending on the exact system design. In this model, the output rotation direction is clockwise.

• Air switch
• Cardan adapter
• Driveshaft (cardan)
• 13 cm adapter
• Adapter between the PTO and the gearbox
• Gasket
• Internal gearbox shaft

5. Warnings

In this article, the most common PTO used for the gearbox of your target vehicle is explained; however, your vehicle’s gearbox may have been installed with a different specification than the common gearbox on the market in Iran. Therefore, to avoid any mistake in selection, it is better to read the gearbox number from the gearbox nameplate and, based on the gearbox serial, choose the appropriate PTO with consultation from our colleagues at Raman Shams Industries.

The dump body manufacturer or dump upfitting company decides which type of hydraulic pump and hydraulic valve(s) to use on dump trucks. So, if you want to replace your old pump with a new one, it is better to have a basic understanding of dump pump types so you can choose the right option. In this article, the most common pump model for your vehicle’s dump system is introduced, but it is recommended to consult Raman Shams Industries experts.