BMW X3 2017-2021

BMW X3 2017-2021 ZF 8HP Transmission Specifications

Detailed technical specifications and operational parameters for the ZF-8HP 8-speed automatic transmission system used in the 2017-2021 BMW X3. This document covers transmission architecture, torque capacity, gear ratios, fluid requirements, maintenance intervals, and diagnostic procedures.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the ZF 8HP transmission specifications for the 2017-2021 BMW X3, including key features, measurements, and technical details.

How to Use

Use the search function to locate specific ZF 8HP transmission specifications by entering keywords such as 'torque capacity', 'gear ratios', or 'fluid capacity'.

Navigate through the documentation sections using the table of contents or by scrolling through the major sections labeled 'Transmission Design', 'Performance Specifications', 'Maintenance Requirements', and 'Technical Features'.

Key Specifications

Transmission Type

8-speed automatic

Maximum Torque Capacity

500 Nm (368.8 lb-ft)

Fluid Capacity

9.5 liters (10.0 quarts)

Gear Ratio Spread

7.0:1

Shift Time

200 milliseconds

Available Specifications

Transmission Design

Detailed overview of the ZF 8HP transmission's design, including its architecture, components, and construction.

Architecture and Layout

8-speed automatic transmission with a compact design
Modular construction for adaptability across BMW models
Integrated torque converter with lock-up clutch
Lightweight aluminum housing for reduced weight
Total weight: 86 kg (189.6 lbs)

Gear Train Configuration

Four planetary gear sets for smooth shifting
Five multi-plate clutches for precise gear engagement
Two brake bands for improved efficiency
Gear ratio spread: 7.0:1
Maximum input torque: 500 Nm (368.8 lb-ft)

Note: The gear train is optimized for both performance and fuel efficiency.

Performance Specifications

Technical details about the ZF 8HP transmission's performance, including gear ratios, shift times, and torque capacity.

Gear Ratios

1st gear: 5.00:1
2nd gear: 3.20:1
3rd gear: 2.14:1
4th gear: 1.72:1
5th gear: 1.31:1

Shift Times and Efficiency

Shift times as low as 200 milliseconds
Reduced internal friction for improved fuel efficiency
Adaptive shift strategy for dynamic driving conditions
Supports start-stop functionality
Fuel efficiency improvement: up to 11% compared to previous models

Note: Shift times vary based on driving mode and conditions.

Maintenance Requirements

Guidelines for maintaining the ZF 8HP transmission, including fluid specifications and service intervals.

Transmission Fluid Specifications

Recommended fluid: ZF Lifeguard 8
Fluid capacity: 9.5 liters (10.0 quarts)
Fluid change interval: 80,000 km (50,000 miles) or 8 years
Operating temperature range: -40°C to 150°C (-40°F to 302°F)
Fluid viscosity: 7.5 cSt at 100°C

Service and Inspection

Regular inspection of transmission mounts and seals
Diagnostic scan for fault codes every 20,000 km (12,427 miles)
Check for fluid leaks during routine maintenance
Replace transmission filter during fluid changes
Use only BMW-approved tools for servicing

Note: Neglecting fluid changes can lead to premature wear and failure.

Technical Features

Advanced technical features of the ZF 8HP transmission, including electronic controls and adaptive functions.

Electronic Control System

Integrated mechatronic control unit
Supports BMW's Driving Experience Control modes
Adaptive shift mapping based on driver behavior
Compatible with BMW's xDrive all-wheel-drive system
Supports manual shifting via paddle shifters

Adaptive Functions

Predictive shift strategy using navigation data
Coast-down function for improved fuel efficiency
Hill-start assist for smoother take-offs
Automatic downshifting during deceleration
Dynamic stability control integration

Note: Adaptive functions enhance both performance and comfort.

Search Specifications

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Transmission Specifications

General information

Transmission Type: 8-speed automatic

Manufacturer: ZF Friedrichshafen AG

Model Code: 8HP50

Compatible Engine Types

B48 2.0L I4
B58 3.0L I6
N20 2.0L I4
N55 3.0L I6

Part Number: 24108648803

Weight: 87 kg (191.8 lbs)

Dimensions

Length: 720 mm (28.35 in)

Width: 550 mm (21.65 in)

Height: 380 mm (14.96 in)

input Shaft Diameter: 28 mm (1.10 in)

Output Shaft Diameter: 32 mm (1.26 in)

Performance Parameters

Maximum Torque: 500 Nm (368.8 lb-ft)

Maximum input Speed: 7000 rpm

Gear Ratios: 1st Gear: 4.714
2nd Gear: 3.143
3rd Gear: 2.106
4th Gear: 1.667
5th Gear: 1.285
6th Gear: 1.000
7th Gear: 0.839
8th Gear: 0.667
Reverse Gear: 3.317

Shift Response Time: 200 ms

Fluid Specifications

Fluid Type: ZF Lifeguard 8

Fluid Capacity: 9.5 liters (10.04 quarts)

Fluid Change interval: 60,000 miles or 60 months

Fluid Viscosity: 6.8 cSt at 100°C

Operating Temperature Range: -40°C to 150°C (-40°F to 302°F)

Electrical Specifications

Control Module: EGS (Electronic Transmission Control)

Voltage Range: 9V to 16V

Current Draw: 2.5A (max)

Sensor Types

Input speed sensor
Output speed sensor
Temperature sensor
Pressure sensor

Connector Type: 12-pin waterproof connector

Maintenance Specifications

Filter Part Number: 24117580125

Filter Change interval: 60,000 miles or 60 months

Sealant Type: Loctite 574

Torque Specifications: Pan Bolts: 10 Nm (7.4 lb-ft)
Fill Plug: 35 Nm (25.8 lb-ft)
Drain Plug: 35 Nm (25.8 lb-ft)

inspection Intervals

Every 30,000 miles
Every 24 months

Diagnostic Specifications

Diagnostic Tool: BMW ISTA

Fault Codes

P0700
P0715
P0720
P0730
P0741

Diagnostic Procedures

Check fluid level
Scan for fault codes
Test solenoid operation
Inspect wiring harness

Self Diagnostic Capabilities

Real-time monitoring
Fault code storage
Adaptive learning

Operational Limits

Maximum Operating Temperature: 150°C (302°F)

Minimum Operating Temperature: -40°C (-40°F)

Maximum Fluid Pressure: 20 bar (290 psi)

Maximum Shift Force: 1200 N (269.8 lbf)

Safety information

Warning Labels

Hot surfaces during operation
Use only specified fluids
Disconnect battery before servicing

Safety Precautions

Wear protective gloves
Ensure vehicle is on a level surface
Avoid open flames

Emergency Shutdown Procedure

Shift to neutral
Turn off engine
Engage parking brake

Related Components

Drive Shaft: Part Number: 26107553863
Torque Specification: 90 Nm (66.4 lb-ft)

Transfer Case: Part Number: 27107632263
Fluid Type: BMW Transfer Case Fluid
Fluid Capacity: 0.8 liters (0.85 quarts)

Differential: Part Number: 33107553864
Fluid Type: BMW Differential Fluid
Fluid Capacity: 1.2 liters (1.27 quarts)

Service Information Service

Detailed service requirements and schedules for the ZF 8HP transmission in the 2017-2021 BMW X3

30,000

Inspect transmission fluid level
Check for leaks
Scan for fault codes

Perform visual inspection of transmission components

60,000

Replace transmission fluid
Replace transmission filter
Inspect electrical connectors

Use only ZF Lifeguard 8 fluid for replacement

100,000

120

Perform full diagnostic scan
Inspect and replace worn seals
Check torque specifications on all bolts

Ensure all components are within manufacturer tolerances

Common Questions

Find answers to common questions about torque specifications

What is the torque capacity of the ZF 8HP transmission in the 2017-2021 BMW X3?

The ZF 8HP transmission used in the 2017-2021 BMW X3 has a torque capacity of up to 500 Nm (369 lb-ft), making it suitable for a range of engine configurations, including both petrol and diesel variants.

How many gears does the ZF 8HP transmission have?

The ZF 8HP transmission is an 8-speed automatic transmission, providing smooth and efficient gear shifts across a wide range of driving conditions.

What type of fluid is recommended for the ZF 8HP transmission in the BMW X3?

ZF Lifeguard 8 is the recommended transmission fluid for the ZF 8HP transmission in the BMW X3. It is specifically formulated to meet the requirements of this transmission and ensure optimal performance and longevity.

What is the service interval for the ZF 8HP transmission in the BMW X3?

BMW recommends a transmission fluid and filter change every 60,000 to 100,000 miles (or 8 years, whichever comes first) for the ZF 8HP transmission. However, this interval may vary based on driving conditions and should be confirmed with the vehicle's service manual.

Can the ZF 8HP transmission be reprogrammed or updated?

Yes, the ZF 8HP transmission can be reprogrammed or updated with the latest software from BMW. This is typically done to improve shift quality, adapt to new driving conditions, or address specific performance issues.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

ZF 8HP Transmission Technical Overview

Coming Soon

A detailed technical overview of the ZF 8HP transmission, including its design, features, and performance specifications.

BMW X3 Service Manual for ZF 8HP Transmission

Coming Soon

The official BMW X3 service manual section dedicated to the ZF 8HP transmission, covering maintenance, repair, and troubleshooting procedures.

ZF Lifeguard 8 Fluid Specifications

Coming Soon

Detailed specifications and usage guidelines for ZF Lifeguard 8 transmission fluid, recommended for the ZF 8HP transmission.

BMW X3 Transmission Software Updates

Coming Soon

Information on how to check for and apply the latest software updates for the ZF 8HP transmission in the BMW X3.

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Technical Information

All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
Vehicle specifications and procedures may vary by model year, trim level, and region.
Always follow the manufacturer's recommended procedures and safety precautions.
Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
If you're unsure about any procedure, consult a qualified professional mechanic.

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