AI-Powered · Industry · Marine · Offshore · ISO 4413

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Liebherr BOS 47000 · Fault Diagnosis Mode
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General Fault Diagnosis Pressure Analysis Maintenance Sizing
YOU
Case drain pressure on A10V is reading 4.8 bar during hoisting. Is this a shaft seal issue?
HYDROMIND AI
A case drain of 4.8 bar on the Rexroth A10V exceeds the standard 3 bar threshold and strongly indicates shaft seal degradation or internal bypass. On the BOS 47000 hoisting circuit this is typically caused by:

1. Worn shaft seal (replace per RA 92003)
2. Blocked case drain line (check 1.5 bar back-pressure limit)
3. Elevated case temperature — verify oil temp ≤60°C
KB-041: A10V Shaft Seal KB-017: BOS-47000 HPU ISO 4413 §6.4
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Quick Reference

Hydraulic & Electrical Calculator

METRIC IMPERIAL
Q
Pump Flow Rate
Q = (D × N) / 1000
cc/rev
RPM
Flow Rate Q = 179.1 L/min
P
Drive Power
P = (p × Q) / (600 × η)
bar
L/min
Power P = 86.2 kW
F
Cylinder Force
F = p × A
bar
mm
Force F = 157.1 kN
V
Pipe Flow Velocity
v = Q / A
L/min
mm
Velocity v = 3.7 m/s
RV
Relief Valve Check
ISO 4413 §6.3 — min 10% margin
bar
bar
Status = PASS ✓
T
Reservoir Volume
ISO 4413 §6.7 — min 3× Q
L/min
×
Min Volume = 540 L
kW
Motor Power (3-Phase)
P = √3 × V × I × PF
V
A
Power P = 88.9 kW
I
Full Load Current
I = P / (√3 × V × PF × η)
kW
V
Current I = 152.3 A
HP
kW ↔ Horsepower
1 kW = 1.341 HP
kW
HP
Equivalent = 90 kW = 120.7 HP
Ω
Voltage Drop
ΔV = (2 × I × L × ρ) / A
A
m
Voltage Drop = 5.0 V
τ
Motor Torque
τ = 9550 × P / N
kW
RPM
Torque τ = 580.4 N·m
↔
Pressure Converter
bar ↔ PSI ↔ MPa
bar
PSI
MPa = 25.0 MPa
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Knowledge Base

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Process

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01

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02

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03

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Field Feedback

Trusted by Offshore Engineers

HydroMind gave me the Liebherr BOS case drain fault tree in under 2 minutes. Previously that required calling Liebherr tech support and waiting hours. This is a genuine game-changer for offshore troubleshooting.

KA
Khalid Al-Rashidi
Senior Crane Technician · UAE Offshore, ADNOC Fleet

The system design tool generated a complete BOM with ISO 4413 pipe sizing for our North Sea HPU replacement project. The Rexroth A10V sizing came back spot-on matching our existing specs. Impressive accuracy.

JM
James McAllister
Hydraulic Systems Engineer · North Sea, Equinor Operations