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XSelector® Sizing Program
Use our online portal or our mobile apps to size products to help achieve optimum performance for your application.
AOHM/AOVHM Series
Product Type
Heat Exchanger
Solution
Hydraulic Oil Cooling
Application
Mobile Applications
Technology
Air Cooled, Copper Tube / Aluminum Fin
Mobile Air-Cooled Hydraulic Oil Coolers — Hydraulic Motor Drive
The Thermal Transfer Products AOHM and AOVHM Series are mobile air-cooled hydraulic oil coolers built with a copper-tube, aluminum-fin core and driven by a long-life hydraulic motor — ideal for off-highway and mobile equipment where electric fan power isn’t practical. The AOHM is the hydraulic-motor version of TTP’s AO Series, and the AOVHM is the hydraulic-motor version of the higher-performance AOVH Series, together covering a wide flow range and high heat removal up to 210,000 BTU/hr.
Their heavy-duty construction is designed for remote mounting away from the engine’s heat, which provides more efficient cooling than mounting near the radiator and avoids blocking main engine airflow. Both models can be configured for one- or two-pass flow — supporting either low-flow/high-heat-rejection or high-flow/high-rejection applications — and can be set up with an internal pressure bypass for cold-start protection. High/low turbulators optimize heat rejection at lower flow rates, and a high-performance fan with adjustable louvers lets you direct heated exhaust air where you want it.
Maximum operating pressure is 300 PSI on the oil side with a maximum operating temperature of 400°F, and NPT connections are standard. (Note the hydraulic motor itself carries a separate 2,000 PSI maximum with 1,000 PSI allowable back pressure — keep case-drain pressure drop to 5 PSI or less to protect pump shaft seals.) TTP’s XSelector® sizing program — available online and as a mobile app — helps size the right model for your flow, heat load, and space.
Consult catalog for additional sizes and technical information.
Product Features
- Interchange for Young OCH
- AO/AOVH Series with hydraulic motor
- Adjustable louvers (manual)
- Heavy duty construction
- Wide flow range
- Long life hydraulic motor
- NPT connections
- One or two pass
| Ratings | |
|---|---|
| Maximum Operating Pressure | 300 PSI |
| Maximum Operating Temperature | 400°F |
| AOHM | High heat removal: Up to 35HP Flow rates: From 1.5–110 GPM |
| AOVHM | High heat removal: Up to 82 HP Flow rates: From 3–210 GPM |
| Materials | |
|---|---|
| Tubes | Copper |
| Fins | Aluminum |
| Turbulators | Steel |
| Manifolds | Steel |
| Connections | Steel |
| Cabinet | Steel with powder coat finish |
| Fan Blade | Aluminum with steel hub |
| Fan Guard | Zinc plated steel |
| Fan Adapter | Steel |
| Product Options | |
|---|---|
| Connection options | SAE or BSPP |
| Number of passes | 1 or 2 |
| Built-in internal pressure bypass | |
| Corrosion resistant coating | |
- All catalog product is available with short lead-times
- Expert application engineers are available to select and size the right product for your application
- XSelector®* is a great tool for optimizing the sizing of TTP coolers. Check out the Apple and Android app stores to download the XSelector® App
- Our distributor One Status portal allows for on demand quoting of coolers and looking up order status
- Custom designs are available
* To register for XSelector® please go to www.thermaltransfer.com/get-in-touch/ and complete the XSelector® Inquiry form and submit.
Download the XSelector® for both Apple and Android formats by searching for XSelector® in their App Stores. You must first register for XSelector® before using it on mobile devices.
Documents
Brochures
AOHM-AOVHM Series
Brochures
AOHM-AOVHM Accessories
Technical
AOHM-AOVHM Technical Information
Service Parts
AOHM AOVHM Series Service Parts
Frequently Asked Questions
They’re mobile air-cooled hydraulic oil coolers from Thermal Transfer Products with copper-tube/aluminum-fin cores, driven by a long-life hydraulic motor instead of an electric fan — built for off-highway and mobile equipment.
Both use a hydraulic motor drive. The AOHM is based on the standard AO core; the AOVHM is based on the higher-performance AOVH core for greater heat rejection. Choose AOVHM when you need more cooling capacity in the same mobile, hydraulically driven package.
On mobile equipment with available hydraulic power, a hydraulic fan motor avoids drawing on the electrical system and holds up well in tough off-road environments. It also allows remote mounting away from engine heat for more efficient cooling.
Up to 210,000 BTU/hr, across a wide flow range, with model choices spanning low-flow/high-heat-rejection to high-flow/high-rejection duty.
The oil side has a maximum operating pressure of 300 PSI and maximum operating temperature of 400°F. The hydraulic motor has its own limits — 2,000 PSI maximum, 1,000 PSI allowable back pressure — and case-drain pressure drop should stay at or below 5 PSI to protect pump shaft seals.
Yes, for cold-start protection. Note that on the AOVHM, the bypass valve is available on two-pass (AOVHMR) models only — confirm the configuration when ordering.
Configure the AOHM/AOVHM Series
Talk to an engineer at TTP.
Finding the right thermal management solution shouldn’t be a guessing game. Whether you need a quick price quote, technical specs, or a fully custom engine cooling system designed from the ground up, our team is ready to help.
Fill out the form below, and one of our application engineers will reach out to ensure your equipment stays cool under pressure.