Vehicle Models Using This Mercedes PTO Configuration:

MERCEDES: ACTROS 1838 LS, ACTROS 1844, ACTROS 1850, ACTROS 1935/45, ACTROS 1948 S,
ACTROS 2038, ACTROS 2435, ACTROS 2427, ACTROS 2544, ACTROS 2550, ACTROS 2638 S, ACTROS 2644,
ACTROS 2650, 3235, 3238, 3535, AXOR 1831, AXOR 1835, AXOR 1840, ACTROS 1843, ACTROS 1848, ACTROS 1856,
ACTROS 1857, AXOR 2031, AXOR 2040, AXOR 2531, AXOR 2535, AXOR 2540, ACTROS 2548, ACTROS 2553,
ACTROS 2557, AXOR 2635 K, AXOR 2640 K, ACTROS 2643, ACTROS 2648, AXOR 3231, AXOR 3235,
AXOR 3240, ACTROS 3443 K, ACTROS 3348 K, ACTROS 4140 K, ACTROS 4143 K, ATRON 2729 6X4 (BRAZIL),

ACTROS 1729, ACTROS 1735, ACTROS 1827, ACTROS 1834, ACTROS 1838, ACTROS 1929, ACTROS 1935,
ACTROS 2429, ACTROS 2527, ACTROS 2531, ACTROS 2534, ACTROS 2629, ACTROS 2631, ACTROS 2635,
ACTROS 2638, ACTROS 3229, ACTROS 3234, ACTROS 3535, ACTROS 1831, ACTROS 1835, ACTROS 1840,
ACTROS 1934, ACTROS 1938, ACTROS 1953, ACTROS 2044, ACTROS 2050, ACTROS 3031, ACTROS 3331,
ACTROS 3335, ACTROS 3340, ACTROS 3235, ACTROS 2031, ACTROS 2040, ACTROS 3548, ACTROS 3553,
ACTROS 3557, ACTROS 2641, ACTROS 3244

Compatible Gearbox Models for This PTO:

MERCEDES:
G 125-9/16, G 135-16, G 155-16/11.9 (FINO A / UNTIL NR 206764),
G 155-16/14.0 (FINO A / UNTIL NR 206764), G 155-9/16,
G 180-16/11.9 (FINO A / UNTIL NR 206764), G 181-9,
G 200-16/11.9 (FINO A / UNTIL NR 206764),
G 210-16/14.2, G 221-9, G 240-16/11.7,
G 255, G 260-16, G 260-16/9.75

To mount the PTO onto the gearbox, the housing incorporates a square mounting plate with four bolt holes. These holes allow the PTO to be securely fastened to the adapter plate. The adapter is typically a multi-hole polygonal plate that bolts to the PTO on one side and to the main gearbox on the other, forming a rigid and reliable mechanical interface.

In this configuration, the PTO is first secured to the adapter plate, and then the complete assembly is mounted onto the gearbox housing. As a result, this method improves structural strength, simplifies servicing, and reduces the risk of oil leakage at the connection point.

This PTO model is specifically designed for rear gearbox installation. The mounting interface is provided through a multi-hole port on the adapter plate, and the fastening bolts connect the adapter, PTO housing, and main gearbox casing into a single rigid assembly. This configuration ensures stability under high torque loads and shock forces generated by hydraulic pump operation in heavy-duty vehicles such as the MERCEDES ACTROS 1843 B.

Main components required for this connection:

• Internal gearbox shaft for transmitting torque from the main transmission to the PTO and hydraulic pump.
• Gearbox-to-PTO adapter plate to ensure correct mechanical engagement and shaft alignment (compatible with standard market PTO configurations).

The internal gear arrangement of the PTO must mesh precisely with the main gearbox gears, ensuring full tooth engagement without backlash. In this Mercedes configuration, the unit uses spur gears, and the tooth dimensions, pressure angle, and spacing are engineered to provide smooth torque transfer with minimal noise, reduced wear, and high mechanical efficiency. The optimized gear profile and calculated center distance help prevent impact loading, tooth damage, and excessive vibration, thereby extending the service life of both the gearbox and the PTO assembly.

PTO units are typically manufactured in two main configurations: single-gear and dual-gear types. In a single-gear design, power flows through a single gear path, resulting in a more compact and simplified structure. Therefore, this configuration is commonly used for light to medium-duty hydraulic applications and offers easier servicing and maintenance.

In this MERCEDES ACTROS 1843 B PNEUMATIC PTO model, the gear arrangement is optimized to supply sufficient torque for tipper and hydraulic systems while maintaining predictable maintenance intervals and long-term durability.

The engagement and disengagement mechanism of a PTO can be configured as manual, pneumatic, vacuum-assisted, or electric, depending on vehicle configuration and operational requirements. In the MERCEDES ACTROS 1843 B PNEUMATIC PTO, a pneumatic control system is used. This system operates through the vehicle’s air circuit, utilizing a pneumatic valve and actuator to ensure smooth, controlled, and safe engagement. As a result, component wear is reduced and stable torque transmission is maintained under demanding working conditions.

This PTO features an ISO-standard output port, which allows ISO hydraulic pumps to mount directly without modification. As a result, the system provides a rigid, precisely aligned, and backlash-free connection that ensures efficient torque transmission and long-term mechanical stability—especially in heavy-duty applications such as the MERCEDES ACTROS 1843 B PNEUMATIC PTO configuration.

Depending on the hydraulic pump type, PTO ratio, and overall system layout, operators can use one of the following three connection methods:

1. ISO Pumps: Direct mounting of the hydraulic pump onto the PTO ISO output, creating a compact and efficient hydraulic pump drive system with minimal additional components.
2. UNI Pumps: Use of an adapter plate to convert the ISO interface to UNI, matching the pump flange design and shaft configuration while maintaining proper alignment.
3. Flange & Cardan Shaft: Installation of a flange on the PTO output and transmission of rotational power via a cardan shaft to a remotely mounted hydraulic pump or auxiliary hydraulic unit.

The output rotation direction of a PTO depends on the internal gear engagement design and the number of gear stages within the transmission system:

1. Single-Gear Units:
   These units typically reverse the input rotation. Therefore, if the gearbox input rotates clockwise, the PTO output rotates counterclockwise—and vice versa.
2. Dual-Gear Units:
   Because torque passes through multiple gear stages, engineers can intentionally configure the final output rotation direction to match specific hydraulic system requirements.

In the MERCEDES ACTROS 1843 B PNEUMATIC PTO, the output shaft rotates clockwise. Therefore, when selecting a hydraulic pump for this PTO-driven hydraulic system, always match the pump shaft rotation to the PTO output direction. Otherwise, incorrect rotation will reduce hydraulic efficiency, increase internal stress, create cavitation within the pump, and ultimately accelerate component wear or mechanical failure.

• Pneumatic Switch: Enables smooth engagement and disengagement of the pneumatic PTO system directly from the truck cabin.
• Cardan Adapter: Connects the PTO flange securely to a cardan shaft while maintaining proper torque transmission and alignment.
• Cardan Shaft: Transfers rotational power from the PTO output to a remotely mounted hydraulic pump or auxiliary hydraulic equipment.
• 130 mm Spacer (if required): Adjusts mounting distance, improves drivetrain alignment, and reduces vibration under load.
• Gearbox-to-PTO Adapter Plate: Matches bolt patterns and gearbox housing configurations to ensure precise mechanical compatibility.
• Sealing Gasket / O-ring: Provides reliable oil sealing at the mounting interface and prevents hydraulic or transmission fluid leakage.
• Internal Gearbox Shaft: Acts as the primary torque-transmitting shaft between the main transmission and the PTO unit in heavy-duty truck applications.

This guide highlights the most common PTO configuration engineered for standard heavy-duty truck transmission models used in vehicles such as the MERCEDES ACTROS 1843 B. In particular, the MERCEDES ACTROS 1843 B PNEUMATIC PTO with ISO short output and rear-mounted design is widely compatible with gearbox families such as the G155 series for hydraulic pump drive and tipper applications.

However, your truck may operate with a customized, upgraded, or previously replaced gearbox that differs from typical market specifications. For this reason, before placing an order, carefully locate and record the exact gearbox model number from the identification plate. Then confirm the specification with Raman Shams technical specialists to ensure full mechanical compatibility, correct PTO ratio selection, proper torque transmission, and long-term reliability of your hydraulic and tipper system.

Body builders and upfitting companies usually define the hydraulic tipper pump and control valve according to the vehicle’s application, load capacity, and PTO system configuration. In heavy-duty trucks such as the MERCEDES ACTROS 1843 B equipped with a pneumatic PTO, selecting the correct hydraulic pump directly affects torque transmission, tipping speed, and overall system reliability.

If you plan to replace an existing hydraulic pump, carefully evaluate key specifications including pump type (high-speed or low-speed), displacement (cc/rev), operating pressure (bar), flow rate, valve configuration, gearbox compatibility, and hydraulic circuit design. By reviewing these parameters, you ensure that the new pump matches the PTO output ratio, gearbox characteristics, and real working conditions of your tipper system.
Although this guide references commonly used hydraulic pump options, we strongly recommend consulting Raman Shams technical advisors before completing your purchase. Their expertise will help you select the most efficient and durable combination of PTO, hydraulic pump, and auxiliary components for long-term fleet performance.