Giant installation instructions Repair Instruction LP350, LP400, LP450, Valve Replacement

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REPAIR INSTRUCTION - LP350, LP400, LP450

VALVE REPLACEMENT

1)With a 30mm wrench remove the three (3) tension plugs (#48) from top of valve casing (43).

2)Remove discharge and inlet valves (#46), pulling them upwards out of the valve casing. It maybe necessary to use a slide hammer tool.

3)With the valve assembly pointed down, place a dowel rod through the top of valve cage. Hold assembly in hand and tap end of dowel sharply with mallet until assembly pops free.

4)Inspect valve seats (#46A) and valve plates (#46B) for damage and replace if needed.

5)Check valve casing (#43) surfaces for damage.

6)Replace o-rings (#44A) and reinstall valve assemblies into valve casing. (Lubricate o-rings before installation.)

7)Replace tension plugs (#48) and tighten them securely.

SEAL AND PLUNGER REPLACEMENT

1)Remove the eight (8) manifold nuts and washers (#49A,B) using a 19mm wrench and pull off valve casing (#43). If needed, tap valve casing with a rubber mallet to remove it.

2)Pull seal sleeve (#35) out of crankcase guides.

3)Remove seal case (#37) from seal sleeve.

4)Check plunger surface for wear and pitting. If none is found, proceed to step eleven.

5)If plunger (#29B) is worn, remove tension screw (#29C) with a 17mm wrench. Clean tension screw with wire brush to remove any old locktite.

6)Discard copper gasket (#29D) and replace with new.

7)Clean the front surface of plunger/ crosshead assembly (#25).

8)Install new plunger (#29B) onto plunger/ crosshead assembly.

9)Put some locktite on both surfaces of copper gasket (#29D) and tension screw threads (#29C).

10)Secure plunger in place with tension screw (#29C) and gasket (#29D) and tighten to 33 ft. lbs.

11)Remove v-sleeves (#40) and o-ring (#41) for seal case and replace with new. Lubricate parts before reinstalling.

12)Replace seal case (#35) and seal sleeve (#37) into valve casing. Replace nuts and washers (#49A,B) and tighten to 59 ft. lbs.

DISASSEMBLY OF CRANKCASE

1)Remove valve casing (#43) and plunger pipe (#28B), drain oil.

2)Screw off gear cover (#4) and bearing cover (#14).

3)Remove connecting rod screws (#24) and push the front of connecting rod forward as far as possible. Remove back halves of connecting rods, note which position from which they came from.

4)Turning the crankshaft slightly, carefully hit on side of crankshaft (#22) with a rubber mallet until crankshaft is loose.

5)Check crankshaft and bearing for damage, replace if needed.

REASSEMBLY

6)Using a soft tool, press in the outer bearing ring until the outer edge lines up with the outer edge of crankcase (#1). Attach bearing cover (#14) with shaft seal and o-ring (#16) in place. Fit crankshaft through bearing hole on the opposite side. Press in bearing with bearing cover, keeping the shaft in a horizontal position and turning it slowly so that taper rollers touch the edge of outer bearing ring.

7)Adjust axial bearing clearance to at least .004" and maximum at .006 by placing fitting discs (#20A & 20B) under the bearing cover.

8)After assembly the shaft should turn easily with very little clearance.

9)Bolt connecting rod halves together making sure they are replaced in the same position from which they came from. Tighten connecting rod screws to 264 in.-lbs.

 

 

LP350, LP400 & LP450 KITS

 

TORQUE SPECIFICATIONS

Valve Kit

#09196

Packing Kit, LP400

#09309

 

 

 

Qty Part #

Description

Qty Part #

Description

Position

Description

TorqueAmount

1

7064

Valve seat

6

06083

V-sleeve

 

24

Connecting Rod

264 in.-lbs.

1

7063

Valve plate

3

13349

O-ring

 

29C

Tensioning Screw

33 ft.-lbs.

1

7062

Valve spring

3

13012

O-ring

 

49A

Hexagon Nut

59 ft.-lbs.

Packing Kit, LP350 #09233

3

7140

O-ring

 

 

 

 

Qty Part #

Description

 

 

 

 

 

 

 

6

13016

V-sleeve

Packing Kit LP450

#09234

 

 

 

3

7150

O-ring

Qty Part #

Description

 

 

 

3

13012

O-ring

6

13015

 

V-Sleeve

 

 

 

3

7140

O-ring

3

7102

 

O-ring

 

 

 

 

 

 

3

13012

 

O-ring

 

 

 

 

 

 

3

7140

 

O-ring

 

 

 

7

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Contents LP350, LP400, LP450 Important Operating Conditions Installation InstructionsPulley Information SpecificationsLP350 Pulley Selection and Horsepower Requirements Model LP350Model LP400 LP400 Pulley Selection and Horsepower RequirementsModel LP450 LP450 Pulley Selection and Horsepower RequirementsLP350, LP400, LP450 Exploded View LP350, LP400 & LP 450 Parts ListRepair Instruction LP350, LP400, LP450 Valve ReplacementGiant Industries Limited Warranty

LP450, LP350, LP400 specifications

The Giant LP400, LP350, and LP450 are exceptional hydraulic mini excavators that exemplify versatility, power, and efficiency in the compact machinery market. Each model offers unique features tailored for various excavation needs, making them indispensable for landscaping, construction, and agricultural operations.

Starting with the LP400, this machine stands out with its impressive lifting capacity and excellent reach. Weighing approximately 4 tons, it is powered by a robust engine that delivers optimal performance while maintaining fuel efficiency. The LP400 is equipped with a rigid frame, reinforced boom, and advanced hydraulic system that allows for smooth operation and precise control. Notably, its compact design facilitates work in tight spaces, while its zero tail swing feature ensures maneuverability around obstacles.

The LP350, slightly smaller in size, is specifically designed for urban environments and smaller job sites. It weighs around 3.5 tons and combines power with agility. The machine is ideal for digging, grading, and demolition, featuring a quick attach system that allows users to change attachments easily. The LP350 incorporates advanced technology such as proportional controls for smoother functions and real-time diagnostics to assist operators in maintaining optimal performance.

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In summary, the Giant LP400, LP350, and LP450 represent a blend of strength, agility, and innovative technology. They cater to various excavation needs with their specialized features, making them an excellent choice for professionals in multiple industries. Whether it’s the agile LP350 or the powerful LP450, each model brings reliability and superior performance to the field.