- Mini Hydraulic Excavator
- 307.5 (S/N: GW71-523)
- 308 (S/N: GW81-160)
- 309 (S/N: GW91-101)
- 310 (S/N: GWT1-345)
- 308 (S/N: GW81-160)
Introduction
The special instruction contains a procedure for applying proper torque on solenoid cap screws on the main control valve.
Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.
Reference Section
Reference: Testing and Adjusting , M0090776 , System Pressure - Release
Reference: Torque Specifications , SENR3130
Safety Section
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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility. |
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Failure to follow all safety guidelines prescribed in this document and by governing authorities and regulatory agencies may result in severe injury or death of personnel or machine damage. |
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When removing a major component or attachment, ensure that it is properly blocked or secured before removing mounting hardware. An assembly that is disconnected without proper blocking may shift or fall, resulting in serious injury or death of personnel or machine damage. |
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Personal injury or death can result from improper maintenance procedures. To avoid injury or death, follow the procedures exactly as stated below. |
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Personal injury can result from improper handling of chemicals. Make sure you use all the necessary protective equipment required to do the job. Make sure that you read and understand all directions and hazards described on the labels and material safety data sheet of any chemical that is used. Observe all safety precautions recommended by the chemical manufacturer for handling, storage, and disposal of chemicals. |
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Climbing equipment may be required to access this service point. Refer to the Operation and Maintenance Manual, "Mounting and Dismounting" topic for safety information. |
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Before servicing/performing maintenance on the machine, electrical power must be physically disconnected; battery plugs must be disconnected from the batteries, or the trailing cable must be unplugged, and warning tags and padlocks shall be applied by a certified electrician. Certified electricians shall perform or direct any electrical work, including any energized testing, repair work in controllers, motors, or other approved compartments, and shall insure that all compartments are properly closed and inspected prior to re-energization. All applicable lock out and tag out procedures must be followed. |
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Do not operate the machine if any guards or covers are missing or inadequately secured. Personnel could be seriously injured or machine damage may occur. |
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Observe the safe working load limits of all lifting and blocking devices and keep a safe distance from suspended/blocked loads. Personnel may be seriously injured or killed by falling loads. |
Required Parts
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| Illustration 1 | g06411456 |
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| Illustration 2 | g06411499 |
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| Required Parts | ||
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| Item | New Part Number | Part Name |
| 1 | Solenoid Valve Gp | |
| 2 | Solenoid Valve Gp | |
Rework Procedure
- Position the machine on level ground and adjust the stick in the vertical position. Refer to Illustration 3. Release the hydraulic system pressure, then disconnect the battery switch.
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Illustration 4 g06410881 (H) RH side door
(J) Bolt
(K) Washer
(L) Cover - Open machine RH side door (H). Remove four bolts (J) and four washers (K) and remove the cover (L). Save all parts. Refer to Illustration 4.
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Illustration 5 g06410921 Main control valve
(M) Harness
(N) Strap
(P) Hydraulic pressure sensor
(Q) Water separator sensor - Disconnect the harness (M) from the solenoids on the main control valve. Disconnect the harness from water separator sensor (Q). Remove the strap (N) and disconnect the harness from the hydraulic pressure sensor (P). Refer to Illustration 5.
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Illustration 6 g06410938 Harness on main control valve
(M) Harness
(Q) Bolts
(R) Washers
(S) BracketShow/hide table
Illustration 7 g06410941 Harness removed - Remove two bolts (Q) and washers (R) and keep the parts. Remove the harness (M) and bracket (S) from the main control valve. Hang the bracket and harness on top of the main control valve. Refer to Illustration 7.
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Illustration 8 g06410966 (T) Bolts - If a leak is found, remove the two bolts (T) and solenoid valve. Retain the hardware. Refer to Illustration 8.
- Install new solenoid valve to the main control valve. Tighten to
2.7 ± 0.7 N·m (23.9 ± 6.2 lb in) Show/hide table
Illustration 9 g06412977 Harness installed on valve block. Show/hide table
Illustration 10 g06412975 Plug identification on solenoid block. - Reinstall harness (M) to solenoid block. Refer to Illustration 9and 10.
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Illustration 11 g06412982 (Q) Bolt
(R) Washer
(S) Bracket - Install the bracket (S) to the main control valve using two bolts (Q) and washers (R) to
15 ± 4 N·m (133 ± 35 lb in) .Show/hide table
Illustration 12 g06412994 (N) Strap
(P) Hydraulic pressure sensor
(Q) Water separator sensor - Connect water separator sensor (Q). Connect the hydraulic pressure sensor (P) and use strap (N) to fix the harness. Refer to Illustration 12.
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Illustration 13 g06410881 (H) RH side door
(J) Bolt
(K) Washer
(L) Cover - Reinstall cover (L) with four washers (K) and four bolts (J). Tighten to
12 ± 4 N·m (106 ± 35 lb in) . Close the side door (H).
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| Illustration 3 | g06411575 |
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Machine position | |
