OM4207 04/10 Automatic Lubrication System - Section 42 42-7 Injector piston (2) is in its normal or “rest” position. Discharge chamber (3) is filled with lubricant from the previous cycle. With pres- sure applied from incoming lubricant (6), slide valve (5) is about to open passage (4) leading to measuring chamber (1). When slide valve (5) opens to passage (4), lubricant (6) is admitted to measuring cham- ber (1). This forces lubricant from discharge chamber (3) through outlet port (7) to the As injector piston (2) completes its stroke, it pushes slide valve (5) past passage (4). This stops further admission of lubricant (6) to passage (4) and measuring chamber (1).
Injector piston (2) and slide valve (5) remain in this position until lubricant pressure in sup- After venting, the injector spring expands, causing slide valve (5) to move. As the valve moves, passage (4) and discharge chamber (3) connect through valve port (8). Further expansion of the spring causes the piston to move upward. This forces the grease into measuring chamber (1) through passage (4) and valve port (8). Discharge chamber (3) The injector is now ready for the next cycle. mal or “rest” is filled with . With pres- ubricant (6), passage (4) 1). passage (4), uring cham- m discharge rt (7) to the its stroke, it mal or “rest” is filled with . With pres- ubricant (6), passage (4) 1).
passage (4), uring cham- m discharge rt (7) to the its stroke, it ag ric ha e ( ss ng As ge (8 the gr pa ch ne e (4). This ant (6) to mber (1). 5) remain ure in sup- expands, the valve chamber ). Further piston to ease into ssage (4) amber (3) xt cycle. INJECT STAGE 1. Injector p position. lubricant f sure appl slide valv leading to STAGE 2. When slid lubricant ( ber (1). T chamber lubrication STAGE 3. As injecto pushes s stops fu passage Injector p in this po ply line ( STAGE 4 After ve causing moves, p (3) conn expansio move up measurin and valv refills. The injec li rt i s 6 . n sl a e n g e t