2023年10月11日星期三

How to Inspect the Caterpillar Excavator Air Intake and Exhaust System

How to inspect the caterpillar325c excavator air intake and exhaust system

1. Inspection of air intake and exhaust systems

2023 CAT ET 2023A 2022A & 2019C Full Service Download and Installation Service

(1) Inspection of air intake resistance. If there is resistance in the intake and exhaust systems, it will be the 1U-5470 engine pressure assembly (Figure 3-1-46).

1) Check the intake pipe and exhaust pipe of the engine air filter to ensure that the pipes are not leaking.

2) Check the engine air filter element. Use a clean engine air filter

3) Check whether there are traces of dirt on the clean side of the engine air filter element. If traces of dirt are observed, it means that the contaminants have entered the engine air filter element and/or filter element seal. . NOTE: Hot engine parts can cause burns. Allow the engine and parts to cool before servicing the engine. Contact with a running engine can result in burns from hot parts or damage from rotating parts. When working on a running engine, avoid contact with hot or rotating parts.

4) Measure using the differential pressure gauge in the 1U-5470 engine pressure test assembly

①As shown in Figure 3-1-50, connect the vacuum port of the differential pressure gauge to test position 3. Test location 3 may be anywhere on intake manifold 2 behind engine air filter 4 and in front of wheel booster 1.

12.2021 Caterpillar ECM ECU Flash Files Full Set Download

②Open the pressure port of the differential pressure gauge to allow it to communicate with the atmosphere.

③Start the engine. Run the engine at high idle speed with no load.

④Record the pressure value, multiply this pressure value by 1.8, and then compare it with the corresponding value below. There is resistance to airflow through an old engine air filter. There will also be some resistance to airflow through a clogged engine air filter. in In the above two cases, the resistance must not exceed 6.2kPa; the resistance of the air flowing through the new air filter element must not exceed 3.7kPa.

(2) Inspection of exhaust resistance. Back pressure is the pressure difference between the exhaust pressure at the elbow outlet and the atmospheric pressure. The tools required to check exhaust resistance are 1U-5470 engine pressure components (Figure 3-1-46). NOTE: Hot engine parts can cause burns. Allow the engine and components to cool before servicing the engine. Contact with a running engine can result in burns from hot parts or injury from rotating parts. When working on a running engine, avoid contact with hot or rotating parts. Use the differential pressure gauge in the 1U-5470 Engine Pressure Test Assembly to measure exhaust backpressure. Use the following steps to measure exhaust back pressure.

1) As shown in Figure 3-1-51, connect the vacuum port of the differential pressure gauge to test position

CAT Caterpillar ET 4 Diagnostic Adapter Truck Diagnostic Tool-high quality

2. Test location 2 may be anywhere on exhaust pipe

3 behind turbocharger 4 and in front of muffler

1. 2) Open the pressure port of the differential pressure gauge to allow it to communicate with the atmosphere.

3) Start the engine. Run the engine at high idle speed with no load.

4) Record the pressure value.

5) Multiply the value in step 4) by 1.80.

6) Compare the value in step 5) with the value below. The exhaust back pressure must not be greater than 10.OkPa.

2023年10月10日星期二

How to Test a Caterpillar Excavator Unit Injector

How to test a caterpillar 325C excavator unit injector

12.2021 Caterpillar ECM ECU Flash Files Full Set Download

This step can help determine why the injector is misfiring.

(1) If you have not yet checked for the presence of air in the fuel, perform the inspection steps and

refer to the "Air in Fuel Test" section. CAUTION: ELECTRIC SHOCK HAZARD. The voltage used

by the electronic unit injector system is 90~120V.

(2) Remove the valve cover and check if there are any broken parts. Repair or replace any broken parts

found. Check all wiring to the solenoid coil. Check to see if the connectors are loose. Also check to see

if the wiring is worn or disconnected. Make sure the connector on the unit injector solenoid coil is well

connected. Perform a tensile test on each wire.

(3) Check for signs of oil leakage. Investigate the cause of the fuel leak. Repair oil leaks.

(4) For the single-piece injector cylinder that is suspected to be faulty, check the adjustment of the valve

clearance. Please refer to the "Inspection and Adjustment of Engine Valve Clearance" section.

(5) Make sure the bolts holding the unit injector are tightened to the correct torque. To check the

torque, loosen the bolts holding the unit injector. Tighten the bolts to the correct torque.

2023 CAT ET 2023A 2022A & 2019C Full Service Download and Installation Service

(6) Remove the suspected faulty unit injector and check for signs of coolant leakage. Leaking coolant

can cause corrosion on the fuel injectors. If the unit injector shows signs of leaking coolant, remove the

injector sleeve and inspect it. If the injector sleeve is damaged, replace it. Inspect unit injectors for

excessive brown stains that have spread to the injector tips. If excessive stains are found, check the fuel

quality. Refer to the "Testing of Fuel Quality" section. Replace the seal on the injector and reinstall the

injector. Check for soot accumulation on the surface of the injector seat. If soot accumulates, there is a

gas leak. The cause of the leak should be found and repaired. If the fault is a gas leak, there is no need

to replace the injector.

CAT Caterpillar ET 4 Diagnostic Adapter Truck Diagnostic Tool-high quality

(7) If the fault cannot be solved, replace the faulty injector with a new one.

2023年10月8日星期日

How to Test the Fuel System Pressure of Caterpillar Excavator

How to test the fuel system pressure of the caterpillar 325C excavator

12.2021 Caterpillar ECM ECU Flash Files Full Set Download

The tools required to test the fuel system pressure are 1U-5470 engine pressure test assembly, 3Y-2888

connector and 3J-1970 O-ring seal. NOTE: Both the 5P-2720 Detector Engagement Set and the

5P-2718 Pressure Detector can be used with these tools. These additional tools will be used later when

installing the pressure probe. Fuel leaks or splashes on hot surfaces or electrical components can cause

a fire. Spills should be removed immediately. Keep all parts clean and free of contamination.

Contaminants can accelerate component wear and shorten their service life. Always be careful not to

lose fluid when inspecting, maintaining, testing, adjusting, and repairing this equipment. Suitable

containers should be prepared to collect the liquid before opening any box or disassembling any parts

containing liquid. All liquids should be handled in compliance with local regulations. The 1U-5470

engine pressure test assembly is shown in Figure 3-1-46. The 1U-5470 engine pressure test assembly

can be used to check the engine’s fuel pressure. There is a gauge in the tool set that records the

pressure

in the fuel manifold. The fuel return pipe is shown in Figure 3-1-47,

and the fuel pressure test is shown in Figure 3-1-48.

2023 CAT ET 2023A 2022A & 2019C Full Service Download and Installation Service

Whether under normal working conditions or under loaded working conditions, the fuel pressure should

be within the range of 400~525kPa; during low idle speed operation, the fuel pressure at the fuel filter

inlet should be within the range of 400~435kPa. If the pressure difference △P on both sides of the

filter CAT Caterpillar ET 4 Diagnostic Adapter Truck Diagnostic Tool-high quality

is ignored, the fuel pressure in fuel supply channel 1 should be equal. For a new fuel filter, the pressure

differential loss on both sides of it is usually 35kPa. If worn particles accumulate in the fuel filter, the

pressure difference across it will increase. If the filter becomes clogged, the fuel supply pressure may

drop to 69kPa before the driver notices significant power loss. If the fuel pressure is lower than normal,

it will cause cavitation and cause internal damage to the unit injector. The pressure difference on both

sides of the fuel filter should not exceed 69kPa. Pressure regulator 3 is mounted directly on the

cylinder

head. The pressure regulator is located at the fuel return port toward the rear end of fuel supply passage

1. The oil hole maintains the fuel pressure at low engine speeds.

When checking the fuel pressure on the unfiltered side, follow these steps:

(1) Remove the plug from

the fuel pressure gauge port 6.

(2) Install the joints, seals and 1U-5470 engine pressure test assembly to

the fuel pressure gauge interface 6, so that the pressure of the fuel transfer pump can be measured.

When checking the fuel pressure in fuel supply passage 1, follow the steps below.

1) Remove the plug

from fuel pressure gauge port 7.

2) Install the joints, seals and 1U-5470 engine pressure test assembly

to the fuel pressure gauge interface 7. 3) Run the engine.

NOTE: Before checking fuel pressure, make

sure the fuel filter is clean. A clogged fuel filter will cause the pressure at port 7 of the fuel pressure

gauge to be lower than the pressure at port 6 of the fuel pressure gauge.

2023年9月28日星期四

How to Reassemble a Stroke Motor Speed Reducer

How to Reassemble Doosan DX520LC and DX480LC Hydraulic Excavator Stroke Motor Speed Reducer

Doosan Diagnostic Tool UVIM Support Doosan Excavators High Quality

1. Install seal to jig. Figure 92.

2. Install jig to housing. Figure 93.

3. Clean seal surface. Figure 94.

2020 Doosan Daewoo Excavator Operation and Repair Manual PDF

4. Install seal to hub using jig used in Step 1. Figure 95.

5. Apply lubricant to seal surface. Figure 96.

6. Support ball bearing housing with spacers (1 and 2, Figure 97) and install bearing into housing. Install spacer between balls,noting diameter shown in illustration.