Home > CTM3–CTM14 Concrete Mixer Drum (Upper Part) — TRUEMAX Drum Range

CTM3–CTM14 Concrete Mixer Drum (Upper Part) — TRUEMAX Drum Range

The CTM series represents TRUEMAX's comprehensive portfolio of concrete mixer upper structures, ranging from 4.45 m³ to 20.4 m³ geometric drum capacities. Engineered strictly for wet-mix transit, the drums and internal mixing blades are fabricated entirely from 520JJ high-wear-resistant steel. The robust hydraulic drive architecture integrates Eaton or PMP pumps and motors, coupled with Bonfiglioli, PMP, or Lead374 planetary reducers scaled precisely to the drum payload. Featuring a specialized pneumatic water supply system and standard KT-18 oil cooling radiators, the CTM range maintains optimal thermal stability and operational reliability across prolonged delivery cycles. Manufactured to stringent ISO 9001:2015 and CE standards, these upper parts are configured for seamless integration with commercial 4×2, 6×4, and 8×4 truck chassis platforms.

1. 520JJ Wear-Resistant Steel — Drum shells and mixing blades utilize 520JJ high-tensile steel to mitigate severe abrasion over extended concrete delivery lifecycles.

2. 4.45 m³ to 20.4 m³ Geometric Capacities — Seven optimized drum geometries accommodate diverse payload requirements without compromising critical mixing head space.

3. Premium Hydraulic Architecture — Integrating Eaton or PMP hydraulic pumps and motors ensures reliable torque transmission under maximum load conditions.

4. Scaled Planetary Reducers — Employs heavy-duty Bonfiglioli or PMP reducers for high-capacity drums (8–14 m³) and Lead374 for compact models to align with specific torque demands.

5. Advanced Mixing Geometry — Precision-engineered blade pitch and inclination angles (12° to 16°) optimize the padding rate (62.5%–69.4%) and yield a residual rate strictly below 0.2%.

6. 50–210 mm Slump Compatibility — Processes a broad spectrum of concrete grades, from stiff structural mixes to high-flow pumpable formulations.

7. Pneumatic Water System — Utilizes chassis-derived compressed air to drive the 240–1,000 L water tank, eliminating vulnerable electric pumps in corrosive wet environments.

8. Thermal Stability — Standardized KT-18 oil-cooling radiators maintain hydraulic fluid temperatures within safe operational limits during extended transit shifts.

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Technial Parameters

Model	CTM3	CTM6	CTM8	CTM9	CTM10	CTM12	CTM14
Drum & Mixing Geometry
Mixing Type	Wet	Wet	Wet	Wet	Wet	Wet	Wet
Geometric Volume of Drum (m³)	4.45	9.6	11.8	14.4	14.4	18.4	20.4
Drum & Blade Material	520JJ	520JJ	520JJ	520JJ	520JJ	520JJ	520JJ
Inclination Angle for Drum (°)	16	15	16	13	13.5	12	12
Padding Rate (%)	67.4	63.8	67.8	62.5	69.4	65.2	68.6
Residual Rate (%)	<0.2	<0.2	<0.2	<0.2	<0.2	<0.2	<0.2
Charging / Discharging / Mixing
Charging Speed (m³/min)	≥3	≥3	≥3	≥3	≥3	≥3	≥3
Discharging Speed (m³/min)	>1	>1	>1	>1	>1	>1	>1
Mixing Speed (r/min)	0–14	0–14	0–14	0–14	0–14	0–14	2–14
Slump Range (mm)	50–210	50–210	50–210	50–210	50–210	50–210	50–210
Hydraulic & Drive Components
Hydraulic Pump	Eaton / PMP	Eaton / PMP	Eaton / PMP	Eaton / PMP	Eaton / PMP	Eaton / PMP	Eaton / PMP
Hydraulic Motor	Eaton / PMP	Eaton / PMP	Eaton / PMP	Eaton / PMP	Eaton / PMP	Eaton / PMP	Eaton / PMP
Reducer	Lead374	Lead374	Bonfiglioli / PMP	Bonfiglioli / PMP	Bonfiglioli / PMP	Bonfiglioli / PMP	Bonfiglioli / PMP
Radiator	KT-18	KT-18	KT-18	KT-18	KT-18	KT-18	KT-18
Water System & Overall Dimensions
Water Tank Capacity (L)	240	240	240	350	350	450 / 1000	450 / 1000
Water Supply System	Air pump	Air pump	Air pump	Air pump	Air pump	Air pump	Air pump
Water Supply Pressure (MPa)	0.2	0.3	0.3	0.3	0.3	0.3	0.3
Dimensions (L × W × H) (mm)	3968×1920×2065	5414×2400×2446	5800×2500×2816	6640×2495×2652	6190×2600×2696	7500×2600×2870	8000×2450×2906

Dimensions & Working Range

The general arrangement dictates the loading and discharge geometry. The drum's inclination angle is mathematically flattened on larger models (12° on CTM12/CTM14) to enhance the discharge efficiency of massive payloads. Operators must evaluate the upper part dimensions (ranging from 3,968 mm to 8,000 mm in length) against the specific 6×4 or 8×4 commercial chassis footprint to ensure seamless integration with batching plant loading chutes and on-site clearance requirements.

A complete TRUEMAX mixer truck is sold as a fully integrated vehicle—chassis plus matched CTM drum—built and tested at the TRUEMAX factory. The chassis documentation outlines each lower-part option in detail.

CTM3 with SINOTRUK-HOWO 7 (Light)

The CTM3 (4.45 m³ geometric drum, 240 L water tank, Lead374 reducer) is the urban-transit drum, matched with the SINOTRUK-HOWO 7 4×2 light chassis. This pairing creates a highly maneuverable compact mixer truck for narrow municipal streets and weight-restricted bridges.

CTM6, CTM8, CTM9, CTM10, CTM14 with Mainstream SINOTRUK

These upper parts cover the mainstream payload band. They pair with the SINOTRUK ZZ1257 6×4 chassis or the SINOTRUK ZZ1317 8×4 chassis, depending on drum capacity and regional axle-load regulations. The mainstream SINOTRUK chassis is offered with heavy-duty Weichai WP10 engines across various emission bands.

CTM12 with Mainstream SINOTRUK 8×4 or SINOTRUK-HOWO N7

The CTM12 (18.4 m³ geometric drum, up to 1,000 L water tank, Bonfiglioli reducer) integrates with both the standard 8×4 chassis and the flagship SINOTRUK-HOWO N7. Chassis selection is driven by local regulatory environments (e.g., Euro V compliance) and the necessity for high-speed, long-distance highway transit.

Applications

The CTM series delivers precisely mixed, homogeneous concrete to diverse infrastructure and commercial sites, offering highly scalable drum capacities to match project-specific delivery volumes.

Large-Scale Commercial RMC Supply

Commercial RMC: High-capacity drums (10–14 m³) maximize per-trip volume for high-demand urban markets, reducing fleet turnaround cycles and overall transport costs.

Highway and Civil Infrastructure Delivery

Infrastructure: Compatible with 50–210 mm slump formulations, ensuring the consistent delivery of structural and pavement concrete for bridges, ports, and highways.

Precast and On-Site Shuttle Transit

Precast Operations: Facilitates rapid on-site shuttle transit between batching plants and casting forms, leveraging the >1 m³/min discharge rate to accelerate production.

Restricted Urban and Tunnel Access

Restricted Access: Compact configurations (3–6 m³), paired with 4×2 or light 6×4 chassis, navigate confined city streets, weight-restricted bridges, and tunnel environments effectively.

FAQs

How do geometric volume and rated payload differ?

Geometric volume represents the total internal capacity of the drum, whereas rated payload indicates the maximum concrete volume it is engineered to transport. The variance provides essential head space for the mixing action and accommodates the residual volume between loads. The padding rate (ranging from 62.5% to 69.4%) mathematically defines this payload-to-geometry ratio.

Why does the CTM14 operate at a 2–14 r/min mixing speed while others use 0–14 r/min?

The massive 20.4 m³ geometric volume of the CTM14 presents a higher risk of aggregate segregation if left entirely stationary, as heavier aggregates may settle. The mandatory 2 r/min minimum speed ensures continuous, slow agitation during transit or idling, maintaining homogeneity for exceptionally large mass-concrete deliveries.

What dictates the selection between Lead374 and Bonfiglioli/PMP reducers?

Reducer specification correlates strictly with torque demand. The Lead374 reducer is engineered for the lighter rotational loads of the CTM3 and CTM6 models. The CTM8 through CTM14 drums generate substantially higher torque, necessitating the heavy-duty Bonfiglioli or PMP planetary reducers to ensure prolonged service life under severe operational stress.

What are the material advantages of 520JJ steel for drum construction?

520JJ is a specialized high-tensile, abrasion-resistant steel. Its superior hardness profile significantly extends the operational lifespan of the drum shell and mixing blades against the constant abrasive friction of wet concrete, minimizing fleet downtime for drum replacement or hard-facing maintenance.

What slump range can the drums handle?

Every CTM model processes concrete with slumps ranging from 50 mm to 210 mm. This spectrum covers stiff, low-water structural concrete (50–80 mm) through to high-flow, easily pumpable formulations (150–210 mm), satisfying the vast majority of commercial ready-mix specifications.

Why is a pneumatic water supply utilized instead of an electric pump?

The pneumatic system leverages compressed air directly from the truck chassis to pressurize the water tank. This eliminates the need for separate electric motors and seals that are highly susceptible to failure in wet, corrosive environments, substantially increasing the reliability of the wash-down systems.

Are the CTM upper parts compatible with non-TRUEMAX chassis platforms?

CTM upper parts are primarily engineered for integration with TRUEMAX's proprietary chassis portfolio. While custom retrofitting to alternative commercial chassis is technically feasible, it requires comprehensive engineering evaluation regarding sub-frame alignment, PTO (Power Take-Off) specifications, and regional axle-load compliance.

How should fleet operators select the appropriate drum size?

Drum size must align with batching plant capacity and site access constraints. Specify CTM3 for urban, weight-restricted zones; CTM6–CTM10 for general commercial RMC distribution; and CTM12–CTM14 for high-volume infrastructure projects. Subsequent chassis selection is dictated by these payload parameters and local highway regulations.

Engineering Standardization Across the CTM Portfolio

The CTM range standardizes critical components across all seven payload capacities. By utilizing identical 520JJ wear-resistant steel, Eaton/PMP hydraulic drives, and KT-18 thermal management systems, TRUEMAX significantly reduces maintenance complexity. Fleet operators benefit from consolidated spare parts inventories and unified servicing protocols, regardless of whether they deploy a 3 m³ urban mixer or a 14 m³ flagship unit.

Drum Geometry and Discharge Mechanics

Mixer efficiency is governed by three calibrated parameters: inclination angle, padding rate, and mixing speed. The inclination angle decreases progressively from 16° on the CTM3 to 12° on the CTM14, lowering the center of gravity and optimizing the discharge vector for immense concrete volumes. This engineered geometry ensures a consistent discharge speed exceeding 1 m³/min while maintaining a residual material rate strictly below 0.2%, maximizing yield per trip.

Chassis Integration and Payload Compliance

The CTM upper structures are designed for seamless pairing with commercial heavy-duty truck platforms. Successful integration requires matching the drum's fully-loaded dynamic weight against the chassis's gross vehicle weight rating (GVWR) and axle configurations. TRUEMAX provides engineered pairings to ensure strict compliance with regional highway regulations while maximizing transport efficiency.