Liebherr A 900 / A 902 / A 912 / A 922 / A 932 Litronic Hydraulic Excavator 1997 Service Manual (P/N 8719164)
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Liebherr Models Covered & Key Technical Specifications
Models: A 900 Litronic, A 902 Litronic, A 912 Litronic, A 922 Litronic, A 932 Litronic
Models & Model Codes:
A 900 Litronic — Type 367. Engine variants: Deutz BF4L913 LK49 from S/N 101, BF4L913 LK52 from S/N 901, and BF4M1013E from S/N 4001. Two-speed transmission: 2 HL 100.
A 902 Litronic — Types 356 and 357 from S/N 101; Type 618 from S/N 3785. Engine variants: Liebherr D904TB from S/N 101, D904T from S/N 3001, and D924T-E A1 from S/N 5001. Two-speed transmission: 2 HL 100.
A 912 Litronic — Types 358, 359, 403 and 404 from S/N 101; Types 418, 419 and 420 from S/N 2001. Engine variants: Liebherr D904T, with revised specifications from S/N 3001, and D924T-E A1 from S/N 5001. Two-speed transmissions: 2 AVG 105 from S/N 101 and 2 HL 100 from S/N 2001.
A 922 Litronic — Types 497 and 421 from S/N 101. Engine variants: Liebherr D914T, with revised specifications from S/N 3001, and D924T-E A1 from S/N 5001. Two-speed transmission: 2 HL 100.
A 932 Litronic — Type 360 from S/N 101, with revised machine and axle specifications from S/N 505. Engine variants: Liebherr D914TI, with revised output specifications from S/N 533, and D924TI-E A2 from S/N 5001. Two-speed transmission: 2 HL 100; pump splitterbox: PVG 350 B 381.
Sub-models / Variants:
A 902 Industrie (Type 583) — From S/N 3046; Liebherr D904T engine, with D924T-E specifications from S/N 5001; 2 HL 100 two-speed transmission.
A 932 HD Litronic (Type 361) — From S/N 101, with revised machine and axle specifications from S/N 503; Liebherr D914TI engine, with D924TI-E specifications from S/N 5001; 2 HL 100 two-speed transmission.
Speeder travel-motor data: A 900 (LMV 100), A 902 (LMV 140), and A 912 (LMV 140).
Revised 2 HL 100 transmission sections: A 900 from S/N 1016; A 902 from S/N 2642; A 902 Industrie from S/N 3046; A 912 from S/N 3004; A 922 from S/N 330; A 932 from S/N 3001.
Electrical-section serial breaks: GLD control sections apply from S/N 101 for A 900, 2001 for A 902, 2301 for A 912, 223 for A 922, and 501 for A 932. Additional basic-machine wiring revisions begin at S/N 917, 1072, 4001 and 4594 for A 900; 2533, 3603 and 5001 for A 902; 2464, 3126 and 5001 for A 912; 313, 3047 and 5001 for A 922; and 545, 549 and 5001 for A 932.
Serial breaks identify the applicable specification or service subgroup; match each subgroup heading to the machine configuration.
Model Year: 1997
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Primary operating pressure, working hydraulics: 320 +5 bar at the standard setting; pressure-boost and swing-circuit settings are specified separately by model.
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Engine oil capacity, including filter change: 13.5 L for Deutz BF4L913; approximately 14 L for Deutz BF4M1013E; 18.5 L for the covered Liebherr D904, D914 and D924 E engine variants.
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Engine oil specification for -10° C to +20° C ambient temperatures: API CD/SE, SAE 20W-20 for Deutz BF4L913 and the covered Liebherr D904, D914 and D924 E engines.
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Permissible engine oil temperature: Maximum 115° C (239° F) for the covered Liebherr D904, D914 and D924 E engines.
Liebherr Manual Features & Selected Content Preview
Liebherr service manual P/N 8719164 covers the A 900, A 902, A 912, A 922, and A 932 Litronic hydraulic excavators, including dedicated A 902 Industrie sections. The cover identifies update No. 8, dated November 28, 1997.
PDF Search, Navigation and Diagram Detail
Text access and wiring detail: PDF text search and embedded bookmarks are unavailable. Small wiring labels require zooming; some wire-color legends and connector labels in dense electrical drawings are faint or incomplete, even when enlarged.
Supplied as one printable, 1,806-page PDF, including the original index cover and 249 blank reverse pages.
Hydraulic Controls, Travel Drives and Electrical Diagnosis
The selected coverage below highlights major workshop sections rather than reproducing the full contents. Other topics include rotary connections and the combined hydraulic/fuel tank arrangement.
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Hydraulic pumps: LPVD double-pump commissioning and adjustment, pump-wear assessment through leakage testing, and A4V swing-pump pressure checks.
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Control valves and cylinders: Control-valve troubleshooting, spool-travel checks, and hydraulic-cylinder removal, installation, and resealing procedures.
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Electrical diagnosis: GLR and GLD horsepower-control fault tracing, sensor-controlled automatic low-idle diagnosis, component identification, and serial-specific wiring diagrams.
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Swing and travel drives: SAT swing-drive removal and swing-brake repair, swing-ring replacement, and testing and adjustment data for 2 AVG 105 and 2 HL 100 transmissions.
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Brakes and chassis: Hydraulic brake pressure checks and bleeding, steering-system tests, and oscillating-axle stabilizers, including automatic-control versions.
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Attachment hydraulics: Overload-warning adjustment, load-holding valves, and AS 1, ASH, and AHS hydraulic attachment installations.
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Overhaul boundaries: Engine coverage centers on specifications and adjustments rather than a complete rebuild procedure. FMF/LMV motor, SAT gear, and axle overhauls require separate component publications.
Written for skilled mechanics already familiar with excavator repair, this manual assumes access to standard workshop tools, special fixtures, and test equipment.
Serial-Specific Data and Engine Coverage
Match the model, machine type, and serial-number heading before selecting a procedure. These subgroup distinctions help you choose the appropriate hydraulic and electrical tests for the machine’s configuration.
A 900 engine data distinguishes Deutz BF4L913 and BF4M1013E installations. A 902 Industrie has separate data and maintenance sections from S/N 3046. Liebherr D904/D914 and D924 E engine variants receive their own specification tables.
Engine references include torque, wear-limit, and valve-clearance data alongside speed-adjustment information. Maintenance/inspection schedules include March 1998 revisions; operating instructions and detailed routine-maintenance directions belong to the separate Operation and Maintenance Manual.
Pump Diagnosis and Cylinder Resealing
Working-hydraulic troubleshooting distinguishes control-valve faults from problems in pumps, relief valves, cylinders, and motors. Internal-leakage, pressure-cutoff, and servo-control checks provide the related diagnostic detail.
The A 932 closed swing circuit has a dedicated filtration procedure after pump or motor failure because its oil bypasses the excavator’s return filter.
Cylinder-resealing instructions include piston and rod-bearing seal drawings, with distinctions between Turcon Stepseal and Zurcon Rimseal designs. Further cylinder repairs refer to the separate hydraulic-cylinder repair publication.
Splitterbox, Axles and Steering
The A 932’s PVG 350 B 381 splitterbox has step-by-step removal, disassembly, inspection, and reassembly instructions, separate from the travel transmission. The 2 HL 100 material also explains the HBGV gear-control block, its parking-brake and shifting functions, and associated pressure checks.
Axle sections distinguish AP/APL-B and Kessler assemblies, including disc- and drum-brake configurations. Removal and installation instructions are supported by sectional drawings and bearing-adjustment data.
A 932 four-wheel steering is covered with and without crab steering, including leakage equalization between the steering axles.
The A 902 aluminum-segment coupling has a specific assembly warning: twisted segments can loosen their mounting screws and destroy the coupling. Structural material covers repair welding on the machine and attachments, plus expander-pin joints.
Cab Systems, Attachments and Diagnostic Drawings
Special installations extend to height-adjustable cabs, quick-change adapters, and centralized lubrication. Heater coverage identifies D 1 LC, D 3 LC, and D 5 W units.
KONVEKTA air-conditioning material includes troubleshooting, evacuation and charging procedures, and R12/R134a identification and changeover cautions.
Electrical drawings cover GLR/GLD horsepower control, sensor-controlled automatic low idle, and KONVEKTA air conditioning. Hydraulic schematics show the closed swing loop and automatic oscillating-axle stabilization.
Torque Tables and Workshop Tooling
Reference sections contain Ermeto coupling torques, standard and fine metric hardware torques, and ISO shaft-and-bore tolerance charts. Fluid-capacity, lubricant, hydraulic-pressure, leakage, and electrical-test specifications support the relevant service sections.
Tooling references identify horsepower-control tester 6202698 and spool-travel measuring tool 8007363. Selected fixtures have application and fabrication drawings; electrical connector tooling covers CA-COM, SURE-SEAL, and Deutsch DT systems.
Follow the manual’s pressure-relief, lifting, and machine-support precautions around pressurized hydraulics, raised attachments, and suspended assemblies.
A Preview of Valve Clearances and Splitterbox Endplay
For the D924T-E A1 engines in A 902, A 912, and A 922 machines from S/N 5001, the engine tables specify cold valve clearances of 0.25 mm at the intake and 0.30 mm at the exhaust.
The A 932’s PVG 350 B 381 splitterbox assembly data specifies 0.5–1.1 mm of drive-shaft axial play, alongside component-specific installation torques.
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