Apparatus and method for preparing a hydraulic work machine for towing
AssigneeCaterpillar Inc.
InventorsJerry J. Burckhartzmeyer, Joseph E. Dezelan, Jr., Bryan A. Vogt
Life of this patent
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Abstract
An apparatus and method for preparing a hydraulic work machine for towing in response to a dead engine condition. The apparatus includes a source of hydraulic fluid, a standby pump system hydraulically connected to the source, a plurality of pilot controls adapted for electrical activation by the standby pump system, and a hydraulic brake system. The apparatus also includes a supply valve connected to the pilot controls, and at least one lift cylinder connected to the supply valve and adapted to lift an implement on the work machine. The hydraulic brake system and the lift cylinder are enabled for hydraulic control in response to activation of the standby pump system.
Claims22
An apparatus for preparing a hydraulic work machine for towing in response to a dead engine condition, comprising:
- a source of hydraulic fluid located on the work machine;
- a standby pump system located on the work machine and hydraulically connected to the source;
- a plurality of electrohydraulic pilot controls adapted for electrical activation by the standby pump system;
- a hydraulic brake system located on the work machine;
- a supply valve hydraulically connected to the pilot controls;
- and
- at least one lift cylinder hydraulically connected to the supply valve and adapted to lift an implement on the work machine;
- wherein the hydraulic brake system and the at least one lift cylinder are enabled for hydraulic control in response to activation of the standby pump system.
An apparatus for lifting an implement on a hydraulic work machine in response to a dead engine condition, comprising:
- a source of hydraulic fluid located on the work machine;
- a standby pump system located on the work machine and hydraulically connected to the source;
- a plurality of electrohydraulic pilot controls adapted for electrical activation by the standby pump system;
- a supply valve hydraulically connected to the pilot controls;
- and
- at least one lift cylinder hydraulically connected to the supply valve and adapted to lift an implement on the work machine;
- wherein the at least one lift cylinder is enabled for hydraulic control in response to activation of the standby pump system.
An apparatus for releasing a set of hydraulically actuated brakes on a hydraulic work machine in response to a dead engine condition, comprising:
- a source of hydraulic fluid located on the work machine;
- a standby pump system located on the work machine and hydraulically connected to the source;
- a hydraulic brake system located on the work machine;
- and
- a sequence valve hydraulically connected to the standby pump system and adapted to controllably deliver hydraulic fluid to the hydraulic brake system;
- wherein the hydraulic brake system is enabled for hydraulic control in response to activation of the standby pump system.
A method for preparing a hydraulic work machine for towing in response to a dead engine condition, including the steps of:
- depressing a switch to activate a standby pump system;
- activating a motor in response to depressing the switch;
- activating a hydraulic pump in response to activating the motor;
- enabling a plurality of electrohydraulic pilot controls in response to depressing the switch;
- controllably lifting an implement as a function of the switch being depressed and in response to engaging a hydraulic implement lift control lever;
- and
- controllably releasing a set of brakes as a function of the switch being depressed and in response to engaging a brake release lever.
Dependencies are inferred from the claim text.