(1) Cause of fault 1 The brake pedal does not have a free stroke or the return spring falls off, becomes too soft, and breaks; 2 The bowl and apron of the hydraulic pump swell, and the return spring has no power, causing the cup to close the balance hole. Return to oil or return; 3 Hydraulic pump bowl swell or pump activity is not working; 4 friction plate and brake drum clearance is too small; 5 brake shoe support pin dirt, brake shoes can not freely rotate, or The dirt in the tubing is clogged and the oil return is poor. (2) Failure judgment and elimination method 1 After the vehicle has travelled for a distance, touch the brake drums of each wheel by hand. If all the brake drums are hot, it means that the fault occurs in the master cylinder; if the individual wheels are hot, it means the fault has occurred. There is a wheel brake. 2 If the fault is in the main pump, first check the pedal free line and. If the free stroke meets the requirements, the lamb can be opened in the oil storage chamber of the master cylinder, and the brake pedal is stepped on and released continuously to see the oil return condition. If it cannot return to the oil, it will block the oil return hole; if the return oil is slow, it will cause the skin and apron to swell or return the spring to be ineffective. The master cylinder should be removed and repaired. At the same time, the return of the pedal should also be observed. If the pedal cannot be quickly returned to the home position, the pedal return spring is too soft or broken and should be replaced. 3 If the failure is in the wheel brakes, loosen the bleeder screw first. If the brake fluid is ejected rapidly and the brake shoes return, the oil pipe is blocked and the sub-pump cannot be returned to the oil. The oil pipe should be dredged. If the brake shoe still does not return, the gap between the friction plate and the brake drum should be adjusted. 4 If the repairs and adjustments by the above persons are invalid, the brake drum should be removed to check the condition of the piston bowl and the return spring of the cylinder pump to use the brake shoe pin movement, and repair or replace it if necessary.
Infusion And Injection
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such as I.V cannula, infusion set, syringe, etc.
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