Danfoss MAH Series Manuel utilisateur

Service guide

MAH motor

MAH 6.3 - 12.5

Disassembling and assembling

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Service guide | Disassembling and assembling MAH 6.3 - 12.5

2180R9152 | AX357937856579en-000402 | 07.2021

NOTE: If the motor is disassembled within the warranty period, the motor is no longer covered

by the warranty.

Introduction

Table of Contents Introduction.......................................................................................................................................... 2

1. Disassembling the motor ................................................................................................................. 3

2. Inspection.............................................................................................................................................. 7

3. Assembling the motor ........................................................................................................................ 8

4. Service kit for MAH 6.3 ..................................................................................................................... 13

4.1. Service kit for MAH 12.5 ................................................................................................................... 14

5. Exploeded view MAH 6.3 ................................................................................................................ 15

5.1. Exploded view 12.5 ...........................................................................................................................16

This document covers the instructions for

disassembling and assembling the motor

MAH 6.3 - 12.5

Tools needed for disassembling/assembling the MAH 6.3 - 12.5 motor

Service guide | Disassembling and assembling MAH 6.3 - 12.5

180R9152 | AX357937856579en-000402 | 07.2021

1. Disassembling the

motor

2. Dismantle front cover using a vice.1. Remove parallel key and unscrew front

cover.

3. Remove shaft seal using two screwdrivers.

4. Remove the two small O-rings from

ange.Removesealfromfrontcoverusing

a screwdriver.

5. Unscrew the four screws for housing. 6. Remove housing.

Service guide | Disassembling and assembling MAH 6.3 - 12.5

4180R9152 | AX357937856579en-000402 | 07.2021

7. Remove pistons and retaining plate from

cylinder barrel.

8. Remove retaining guide.

10. Remove cylinder barrel.9. Remove pins and springs.

12. Remove guide pin.11. Remove port plate from  ange.

Service guide | Disassembling and assembling MAH 6.3 - 12.5

180R9152 | AX357937856579en-000402 | 07.2021

14. Remove O-ring from port.13 Remove O-ring from ange..

15. Loosen thrust plate using a screwdriver.

Place screwdriver in slot of thrust plate.

16. Remove swash plate from housing.

17. Wash all parts and replace all seals

(inclusive shaft seal).

Inspect allpartscarefully(see ”Inspection”)

and replace any worn parts.

If the motor has failed, the reason for the

failure must be found and  xed before the

repaired motor is re-installed.

Service guide | Disassembling and assembling MAH 6.3 - 12.5

6180R9152 | AX357937856579en-000402 | 07.2021

Thrust plate with sealing Swash plate Housing

Cylinder barrel

Retaining

guide

Front cover

Pins and springs

Seal

Flange

Pistons

Port plate

Retaining plate

O-rings

Pins

Screws and washers Shaft seal Washer Spring

18. Parts

Service guide | Disassembling and assembling MAH 6.3 - 12.5

180R9152 | AX357937856579en-000402 | 07.2021

2. Hold a ruler against the surface of the

plates and check the tightness against a

light source.

1. Neither port plate nor thrust plate must

show any sign of wear.

2. Inspection 2.1. Port plate and thrust plate

2. Hold a ruler against the surfaces of the

piston shoes to check that the surfaces

are even and smooth and without any

scratches.

2.2. Pistons

1. The thickness of the piston shoes must be

at least 3.4 mm.

The play in the ball and socket joint must

not exceed 0.1 mm.

2.3 Cylinder barrel

1. Check outerbearingsurfaceforlargewear

grooves (not critical).

Check that bushings are free from seizure

and large scratches.

Ensure that pistons can move freely in

bushings.

1. Check that swash plate surface is smooth

and without any big scratches (depth

more than 0.1 mm).

2.4 Housing

Service guide | Disassembling and assembling MAH 6.3 - 12.5

8180R9152 | AX357937856579en-000402 | 07.2021

1. Mount O-ring on ange. 2. Mount guide pin.

WARNING:

Do not use silicone when assembling the

motor. Do not reuse disassembled O-rings;

they might be damaged. Always use new

O-rings.

3. Assembling

Important:

It is essential that the motoris serviced in

conditions of absolute cleanliness. All parts

must be absolute clean before mounting.

4. Mountportplateinitsrightpositionusing

pin as guide.

3. Mount the O-ring in port.

Guide pin

Service guide | Disassembling and assembling MAH 6.3 - 12.5

180R9152 | AX357937856579en-000402 | 07.2021

5. Mount thrust plate with seals on cylinder

barrel. 6. Check that the gap between the cylinder

barrel and the thrust plate is 1.5-2.5 mm.

1.5 - 2.5 mm

7. Mount the cylinder barrel in the ange. 8. Assemble pins and springs.

9. Mount pin/spring assemblies. 10. Mount the retainer guide.

Service guide | Disassembling and assembling MAH 6.3 - 12.5

10 180R9152 | AX357937856579en-000402 | 07.2021

12. Insert the pistons.

11. Mount the retaining plate on the retainer

guide with plain surface pointing upwards.

14. Mount housing using pin as guide.

13. Mount swash plate.

16. Mount the two O-rings in the ange.15. Tighten screws to a torque of 13 Nm.

Ce manuel convient aux modèles suivants

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