Common fault repair methods for construction machinery - Solutions - Huaqiang Electronic Network

Probe domestic high current needle 150 head diameter 3.0 thread needle high current needle total

Factory direct sales - solid capacitor - patch aluminum electrolysis, to ensure that the factory first-class goods!

1. Cleverly change O-ring seals often encounter difficulties in purchasing O-rings during maintenance, which seriously affects the maintenance schedule. In order to complete the repair work as soon as possible, this problem can be solved by cleverly changing the O-ring. For example, after the O-ring at the pipe joint is damaged, first cut an O-ring with the same diameter and larger outer diameter with scissors, and then cut the long part according to the O-ring installation groove size. At 45° angle, finally put it into the mounting groove and press it tightly. When changing the O-ring on the sealing cover, you can apply AB glue on the cross section, and then install it after the bonding is firm.
2. In the hydraulic system of the pipe joint, many pipe joints are connected by special hollow bolts, and each hollow bolt has one undercut. Due to the small diameter of the undercut, when the hollow bolt is installed, the combined washer is easily deflected, causing the hydraulic oil to leak. At this point, the raw material or plastic rope can be used to wrap the hollow bolt back to the outer diameter of the thread slightly, and then install the combination washer, so as to avoid leakage here.

3. Cleverly the oil supply advance angle

Diesel engines of different brands and specifications have different fuel supply advance angles. In order to facilitate the inspection and adjustment of the fuel supply advance angle, the manufacturer has marked the fuel supply advance angle on the diesel flywheel, but this mark is sometimes difficult to find quickly. In this regard, we have summarized a simple and quick method that can be used to match the fuel supply advance angle. This paper takes the adjustment of the fuel supply advance angle of the 4135 diesel engine as an example. The specific methods are as follows:

Firstly, the diesel flywheel is oscillated clockwise according to the valve timing, so that the I cylinder is at the top dead center of the piston compression stroke; secondly, loosen the 2 bolts on the drive shaft of the fuel pump and the high pressure fuel pipe nut of the fuel pump I cylinder, counterclockwise The flywheel has 9 teeth; again, the fuel injection pump joint rotates clockwise, and stops when the oil level of the high pressure oil pipe of the I cylinder is slightly moved; finally, the loosened 2 screws and the high pressure fuel pipe nut of the fuel injection pump I are tightened. can.

The number of teeth of the flywheel ring gear counterclockwise during the above adjustment process is calculated by the following formula:

X=Y÷(360°÷Z)≈ 9

Where: X - counterclockwise to shake the number of teeth of the flywheel ring gear;

Y——the diesel fuel supply advance angle, 23°~26°;

Z——The total number of teeth of the flywheel ring gear, 125.

4. Cleverly fitted with YX-shaped seals

The 2Y3/4 type road roller and the YZD4 type vibratory road roller produced by the former Anhui Provincial Highway Machinery Factory have external threads for the outer end of the steering cylinder cylinder and are used for installing the steering cylinder end cover (with internal thread).

Mounted on the steering cylinder piston is a YX40 type seal for the shaft with an outer diameter of 40 mm. The lip of the sealing ring is stretched outside, and the installation is slightly inadvertent. The external thread of the inlet end of the steering cylinder cylinder can easily damage the lip. To this end, the inner ring of the 7608 type used bearing can be cut into two semi-circular tools and equipped with one movable clamp. With this tool, the YX40 seal can be assembled without damaging the lip. The specific method is as follows:

First, wrap two semi-circular tools around the YX40 seal mounted on the piston, and make the seal lip flush with the semi-circular tool port, then put on the movable clamp (can also be bundled with wire); Use a screwdriver to tighten the clamp and tighten the two semi-circular tools to shrink the diameter of the seal lip to 40 mm. Once again, align the piston with the steering cylinder port and tap the top of the piston rod with your hand. Easily fit the piston with the YX40 seal into the cylinder; finally, loosen the clamp, remove the two semi-circular tools and clamps, and attach the steering cylinder cover.