Cat Brakesaver

morehp · Mar 20, 2013

magoo68 said: ↑

wouldnt a dragging brakesaver want to stall engine between shifts???
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Good point

Superhauler · Mar 20, 2013

morehp said: ↑

Good point
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it may, but i thought you needed a higher rpm for oil delivery to it. i dont know never had to work on one. but looking to buy one to install.

Buckshot7cz · Mar 20, 2013

all three of my trucks have jacobs brakes and brakesavers!!!!!!! And i love them all!!!!!!!

Buckshot7cz · Mar 20, 2013

a brake saver will not kill the motor even at an idle. they have more braking power at higher rpms

morehp said: ↑

Good point
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Buckshot7cz · Mar 20, 2013

YESS!!!!!!!

morehp said: ↑

Engine Hydraulic Retarders

The hydraulic brake retarders are a whole different animal. Engine hydraulic retarders are mounted on the engine. The Caterpillar Brake Saver is the most popular retarder in this class. This retarder operates on the torque converter principle.

In a normal torque converter, vanes on the input housing (which is attached to the engine crankshaft) transmit power through the fluid coupling to the output shaft vanes of the torque converter, which is connected to the input shaft of the transmission. The hydraulic retarder transmits power from the rotor vanes (which are attached to the engine crankshaft) to the retarder housing vanes (which are attached to the engine block or bellhousing). This produces a hydraulic drag which absorbs vehicle motion energy while activated.

To activate the hydraulic retarder, oil is pumped into the housing, and the housing vanes exert drag due to the swirling oil, upon the rotor vanes. To stop the retarder action, simply drain the chamber, which uncouples the two vanes.

The retarder oil pressure supply is delivered from a secondary section of the engine oil pump. The oil used for the retarder comes from the oil sump of the engine, which must therefore have a larger capacity. This section of the oil pump is entirely separate from the engine lubrication section of the oil pump. This oil pump pressure can be modulated before it reaches the retarder housing. More oil pressure in the retarder housing means more retarding action. Less oil pressure results in less retarding action. While the oil is pressurized within the retarder housing, it is constantly being circulated through the oil cooler and back into the oil sump. This is required to remove the heat generated by the retarder friction.

This retarder has a BrakeSaver control valve which regulates the retarder action once it is activated. This control valve in conjunction with a driver control handle, will set a specific retarder action. As the engine slows in RPM due to the retarding action, the BrakeSaver control valve automatically increases the oil pressure in the retarder housing, which keeps the braking action constant as the pumping action of the retarder vanes decreases.

The retarder control valve also provides a proportioning valve function. The driver control handle will set the retarder force desired, when in manual mode, but while in auto mode, the driver's release of both the throttle and the clutch pedal, will apply maximum retarder action automatically. The proportioning valve uses the larger of these two pressures to control the retarding action.

Sent from my iPhone
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morehp · Mar 20, 2013

Buckshot7cz said: ↑

a brake saver will not kill the motor even at an idle. they have more braking power at higher rpms
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Ever had any trouble with the spool valve ? Apart from the odd diaphragm ?

Buckshot7cz · Mar 20, 2013

not mine.. never heard of such a thing but could happen i suppose it would be an easy fix

morehp · Mar 20, 2013

Buckshot7cz said: ↑

not mine.. never heard of such a thing but could happen i suppose it would be an easy fix
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Thanks for the input , the ones I've personally seen have been trouble free apart from the odd oil leak and diaphragm, they do work well especially in your application

Buckshot7cz · Mar 21, 2013

yes sir they do!!

morehp · Mar 21, 2013

superhauler said: ↑

it may, but i thought you needed a higher rpm for oil delivery to it. i dont know never had to work on one. but looking to buy one to install.
Click to expand...

Superhauler how easy are they to come across second hand over there? I know where there is one sitting but it is a long way from you, if your interested I could ask if they are willing to part with it.

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