Heavy Duty Machine Repair Guide

2022年10月27日星期四

Inspection and Adjustment of Kubota Engine Pressure, Top Clearance, and Valve Clearance

Inspection and Adjustment of Kubota BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, Engine Pressure, Top Clearance, and Valve Clearance

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Compression Pressure(by Glow Plug Hole Adaptor Setting)
1. Run the engine until it is warmed up.
2. Stop the engine.
3. Remove the air cleaner, the muffler, the breather tube, the head cover and all glow plugs.
4. Set a compression tester(Code No.07909-30208) with the adaptor(Adaptor L, code No.07909-31301) to the glow plug hole.
5. After making sure that the stop lever is set at the stop position
   (non-injection), run the engine with the starter and measure the compression pressure.
6. Repeat steps 4 and 5 for each cylinder.
7. If the measurement is below the allowable limit, apply a small amount of oil to the cylinder wall through the glow plug hole(or nozzle hole) and measure the compression pressure again.
8. If the compression pressure is still less than the allowable limit, check the top clearance, valve clearance and cylinder head.
9. If the compression pressure increases after applying oil, check the cylinder wall and piston rings.
   NOTE
· Check the compression pressure with the specified valve clearance.
· Always use a fully charged battery for performing this test.
· Variances in cylinder compression values should be under
   10%.

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Top Clearance
1. Remove the cylinder head.(Do not attempt to remove the cylinder head gasket.)
2. Move the piston up and stick a strip of fuse [1.5 mm dia.(0.059
in. dia.),5 to 7 mm long (0.197 to 0.276 in. long)] on the piston head at three positions with grease so as to avoid the intake and exhaust valves and the combustion chamber ports.
3. Lower the piston, and install the cylinder head and tighten the cylinder head screws to the specified torque.
4. Turn the flywheel until the piston exceeds top dead center.
5. Remove the cylinder head, and measure the thickness of the squeezed fuses.
6. If the measurement is not within the factory specifications, check the oil clearance between the crankpin and crankpin bearing and between the piston pin and small end bushing.
DNOTE
· After checking the top clearance, be sure to assemble the cylinder head with a new cylinder head gasket.

Checking Valve Clearance IMPORTANT
· Valve clearance must be checked and adjusted when engine is cold.
1. Remove the cylinder head cover and the glow plugs.
2. Align the"1TC"mark(1) on the flywheel and alignment mark(2)
on the rear end plate so that the No.1 piston comes to the compression top dead center.
3. Check the following valve clearance marked with "*"using a feeler gauge.
4. If the clearance is not within the factory specifications, adjust with the adjusting screw.
5. Then turm the flywheel 6.28 rad(360"), and align the "1TC"mark
(1) on the flywheel and alignment mark (3) on the rear end plate so that the No.1 piston comes to the overlap position.
6. Check the following valve clearance marked with "*"using a feeler gauge.
7. If the clearance is not within the factory specifications, adjust with the adjusting screw.

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NOTE:
· The sequence of cylinder numbers is given as No.1, No.2
and No.3 starting from the gear case side.
· After adjusting the valve clearance, secure the adjusting screw with the lock nut.
(1)"1TC"MarkA: Gear Case Side
(2) Alignment Mark

2022年10月23日星期日

Doosan DL220 Refrigerant Safe Handling Procedures Guide

This article mainly introduces Doosan DL220 Refrigerant Safe Handling Procedures

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The following procedures should be observed for safe handing of refrigerant during vacuum and charging process.
1.Use an approved recovery / charging device which can safely perform vacuum and charge work simultaneously.

2.The new refrigerant has improved cooling characteristics than the old type and care should be used not to overcharge the system.

3. Do not over tighten connections when working on refrigerant system.

4. The new refrigerant system standards require new tools, equipment and parts. Do not attempt to use equipment use in servicing the old refrigerant system.

5. The new refrigerant oil (PAG type) has a high moisture absorption characteristic. When the refrigerant system vacuum seal has been broken, immediately plug up allopenings to prevent moisture from entering into the system.

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6. When joining unions which use O-ring seals, lightly coat O-rings with refrigerant oil. Be careful not to drip oil on the threads of the nut.

7. Be certain the O-rings are seated properly on the refrigerant line lip. Always use new O-rings when reassembling parts. Do not reuse old O-rings.

8. Use a vacuum pump to evacuate refrigerant system of air.

9. When charging the refrigerant system with the engine running, do not open the high-pressure valve on the manifold gauge as the reverse flow of high-pressure refrigerant will rupture the hose.

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10. When releasing the high-pressure hose after completing the charging process, quickly disconnect the hose to minimize refrigerant released to the air.

2022年10月19日星期三

Kubota U10 U20 Excavator Accelerator Bar Adjustment Guide

This instruction shows you how to adjust the accelerator lever for Kubota U10 U20 excavators.

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step:

Adjusting Maximum Speed Make sure the engine governor lever is in the maximum speed position. With the lever in the MAX position, lock the bolt by turning the adjustment bolt until it makes light contact with the accelerator lever (see Section A).

Defect: Improper adjustment may damage the acceleration line.

Adjusting Idle Speed Tilt the accelerator lever fully forward, making sure the accelerator line is free. Defect: Poor adjustment, may cause poor idle speed.

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Set the operating force of the accelerator lever to 20～30N·m(2～3kgf-m). Disadvantage: The handling force is too strong, and it may be difficult to obtain acceleration. Too weak operating force may result in a drop in rotational speed. Follow the route through the acceleration line as shown on the left. Tighten the clamp.

Defect: Wrong wiring that can cause wires to get stuck or damaged.

Connect the accelerator wire to the engine inside the governor rod. (See below.)

Defect: Incorrect connection, could cause the accelerator lever to move too wide and hit the leg.

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2022年10月13日星期四

Perkins Engine Exhaust Gas Valve (NRS) -Assemble Guide

This article mainly introduces Perkins 2806F Engine Exhaust Gas Valve (NRS) -Assemble guide

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1. Ensure that all components are clean and free from wear and damage. If necessary, replace any components that are worn or damaged.

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2. Place valve housing(11) into a suitable support.

3. Install a new O-ring(10) to valve housing (11).

   Ensure that the O-ring seals are correctly installed into the recesses of the valve housing.
4. FilCavity(B) with Tooling(A). Cavity(B) is found on the valve housing(11).

5. Installactuator assembly(6) to valve housing(11).

   Ensure that the actuator assembly is correctlyseated and correctly orientated onto the valve housing.

6. Install Allen head bolts and washers(3). Tighten Allen head bolts to a torque of 28 N·m (248 lb in).

7. Install O-ring(13),O-ring(14),O-rings(15), and
   (16) to valve assembly(7).

8. Installvalve assembly (7) to actuator assembly(6).
   Tighten the valve assembly to a torque of 50 Nm
   (37 Ib ft).

9. Install solenoid (8) to valve assembly(7). Ensurethat the solenoid is correctly orientated. Install washer(9) and nut(9a). Tighten the nut toa torque of 20N-m(177 lb in).

10. If necessary, install temperature sensor (12) to valve housing(1). Refer to Disassembly and Assembly, Temperature Sensor(Cooled Exhaust Gas)-Remove and Install for the correct procedure.

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11. Install a new O-ring seal (2) to adapter(1). Install the adapter to actuator assembly (6). Tighten the adapter to a torque of 20 N-m (15 Ib ft).

12. Install a new O-ring seal(5) to adapter(4). Install the adapter to actuator assembly (6). Tighten the adapter to a torque of 20 N-m(15 b ft).

2022年10月1日星期六

How to Dismantling Volvo_Penta_Md2040 Cylinder Head

This article mainly introduces volvo_penta_md2040 Cylinder head Dismantling

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1. Remove both battery leads. Close the fuel cocks.
2. Close the bottom valve and drain off the water in the sea and fresh water system.
3. Release the hose to the heat exchanger from the sea water pump. Release the exhaust pipe from the exhaust hook.
4. Release the thick rubber hose under the heat ex-
   changer.(Note: the hose is filled with refrigerant).
   Release the thin hose from the refrigerant pump.
5. MD2010, MD2020remove the drive belt for the al-
   ternator/refrigerant pump. Remove the altemator and clamp.
6. Release the relay box from the heat exchanger housing and hang it up.
7. Release the electric cables to the oil pressure relay and to the refrigerant temperature relay and sensor where appropriate).
8. MD2040 remove the cover at the front on the heat exchanger housing's right-hand side. Remove the spacer ring, themostat and rubber seal.

9. Remove the expansion tank complete with heat ex-
   changer.
   MD2010, MD2020: Remove the spring, themostat and rubber seal from the heat exchanger housing.
10. MD2010, MD2020, MD2030: Remove the induction manifold.
   MD2040: Remove the inlet pipe complete with air filter.
11. Release the delivery pipe at the injection pump and injectors. Lift off the delivery pipes together.
   Protect the connections from impurities.

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12. Remove the nut at the top of respective injectors and lift off the fuel leak pipe.
13. Unscrew the injectors. Use a long socket,80 mm.
    MD2010, MD2020, MD2030=22mm MD2040=27mm.
    Remove the copper gaskets under the injectors.
    MD2030 Remove the heat shields (3, Fig.10).
    MD2010, MD2020, MD2030: Remove the inserts
    (4) and the lower copper washers.
14. Release the electric cable to the glow plug. Re-move the conductor rail and   unscrew the glow plug.

Fig.11. Dismantling of circulation pump

15. MD2010, MD2020, MD2030Remove the circula-
     tion pump.
    MD2030: Note. The pump must be released/re-
    moved before the cylinder head is released. Thepump can otherwise be broken. Remove the spring and thermostat.

Fig.12. Dismantling of oil pressure pipe(cylinder block-cylinder head/rocker mechanism)

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16. Remove the oil pressure pipe between the cylinder block and cylinder head(rocker mechanism on MD2040).
17. Remove the valve cover (built together with the in-
let pipe on MD2010, MD2020 and MD2030).

Fig.13. Dismanting of rocker mechanism(MD2040)

1. Rocker mechanism 3. Valve caps
2. Pull rods
18. Release the nuts from the rockers' bearing brack-
   ets. Remove the rocker mechanism(1, Fig.13) andpull rods(2). Remove the valve caps(3, MD2040)
   from the valve stem.
19. Release the cylinder head screws in several sta-
   ges.
   Note: Begin in the middle of the cylinder head and release the screws in a circle outwards.
   Lift off the cylinder head.

2022年9月30日星期五

Perkins 2806F Engine Exhaust Gas Valve(NRS)-Disassemble guide

This article mainly introduces Perkins 2806F Engine Exhaust Gas Valve(NRS)-Disassemble guide

Perkins SPI2 VERSION 2018A Service & Parts CATALOGUE SOFTWARE

Disassembly Procedure Stat By: a. Remove the NOx Reduction System Exhaust Gas Valve(NRS). Refer to Disassembly andAssembly,"Exhaust Gas Valve(NRS)-Remove and Install"for the correct procedure.

1. Place the assembly of NOx Reduction System Exhaust Gas Valve(NRS) into a suitable support.

2. Remove adapter(1) from actuator assembly(6) for the assembly of NRS exhaust gas valve. Remove O-ring seal(2).

3. Remove adapter(4) from actuator assembly(6) for the assembly of NRS exhaust gas valve. Remove O-ring seal(5).

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4. Remove nut (9a) and washer(9) from solenoid(8).
Remove the solenoid for valve assembly(7).

5. Remove valve assembly (7) from actuator assembly(6). Remove O-ring(13),O-ring(14),O-
rings(15), and O-ring(16).

6. If necessary, remove temperature sensor (12) from valve housing(1). Refer to Disassembly and Assembly, Temperature Sensor(Cooled Exhaust Gas)-Remove and Install for the correct procedure.

7. Remove Allen head bolts and washers (3).
Remove actuator assembly (6) from valve housing
(11).

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8. Remove O-ring seal(10).

2022年9月17日星期六

How to Remove Doosan DL22 Cylinder Disassembly

This article mainly introduces Doosan DL22 Cylinders DISASSEMBLY

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NOTE: Keep on hand a container large enough to hold all of the oil in cylinder being repaired. When cylinder rod and head are removed, oil will run out of cylinder.
NOTE: Dispose of drained fuids according to local regulations.
1. Use an allen wrench to remove bolts that hold cylinder head t
o cylinder tube. See Figure 8.

2.Support cylinder rod with a lifting sling.See Figure 9.Side cylinder rod out of cylinder tube.Rotate cylinder rod slightly as it is being pulled from cylinder tube.This will make it easier to pull rod out of tube.

3.Set cylinder rod assembly in a repair fixture and secure rod in place.See Figure 10.Use a power wrench and socket to remove nut that holds piston on rod.

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5. Do not remove slipper seal, backup ring, and back ring from piston. If these three items are not scratched or damaged. See Figure 12. Once these 3 items are removed from piston, they must be replaced. They cannot be reused. Exercise caution when removing slipper seal to prevent damage to piston O-ring groove. Remove wear rings from piston.

6. When disassembling cylinder head do not remove slipperseal, backup ring, back ring, or dust seal unless items are scratched or damaged. If seals are removed from head, they must be replaced. They cannot be reused. Remove retaining ring,(1, Figure 13). Use a screwdriver to remove dust seal(2) from head.

7. Use caution to prevent damage to any parts of U-packing