Method for flushing a closed loop hydraulic system
AssigneeCaterpillar Inc.
InventorsRon A. Bjerke, D. Clark Hopkins, Maury G. Mannlein
Life of this patent
Estimating the term…
Abstract
A method of flushing a closed loop hydraulic system utilizes a pair of adapters temporarily disposed between a drive motor and a pair of hoses during the flushing procedure. The adapters block communication between the hoses and the motor and cover the inlet/outlet ports of the motor. By connecting a case drain line to one of the adapters and running the engine to drive a charge pump, oil is circulated through the hose connected to that adapter, the case drain line, a case drain line filter and is returned to a tank. The case drain line is then switched to the other adapter so that oil from the charge pump is circulated through the other hose.
Claims11
A method of flushing a closed loop hydraulic system having a motor, a reversible variable displacement pump driven by a prime mover and connected to the motor through first and second flexible hoses, a flexible case drain line connected to the motor and to a tank, and a charge pump driven by the prime mover and communicating with the hoses comprising the steps of;
- (a) disconnecting the hoses and the case drain line from the motor;
- (b) connecting the case drain line to the first hose through a first adapter;
- (c) blocking the second hose from the atmosphere with a second adapter;
- (d) driving the charge pump for a predetermined period of time for circulating oil through the first hose and the case drain line;
- (e) disconnecting the case drain line from the first hose;
- (f) connecting the case drain line to the second hose through one of the adapters;
- (g) blocking the first hose from the atmosphere with the other adapter;
- (h) driving the charge pump for a predetermined period of time for circulating oil through the second hose and the case drain line;
- and
- (i) filtering the oil passing through the case drain line.
A method of flushing a closed loop hydraulic system having a motor, a reversible variable displacement pump driven by a prime mover and connected to the motor through a pair of hoses, a case drain line connected to the motor, and a charge pump driven by the prime mover and communicating with the hose comprising the steps of:
- disconnecting the hoses from the motor;
- connecting a pair of adapters to the motor;
- connecting the hoses to the adapters so that each hose communicates with an inlet port in the associated adapter;
- disconnecting the case drain line from the motor;
- capping a case drain opening in the motor;
- connecting the case drain line to one of the adapters so that the case drain line communicates with an outlet port of the adapter;
- blocking on outlet port in the other adapter;
- driving the charge pump for a predetermined period of time;
- switching the case drain line to the other adapter;
- and
- driving the charge pump for the predetermined period of time.
Dependencies are inferred from the claim text.