AP31.11-D-3121A | Lubricate and check operation of trailer hitch with detachable ball neck | 27.5.10 |
MODEL 638 with CODE (Q50) Trailer hitch with removable ball head
MODEL 639 with CODE (Q50) Trailer hitch with removable ball head
N31.11-0230-01
Shown on model 638
A Cover on bumper
B Cover for
Ball neck mounting
N31.11-0227-01
N31.11-0229-01
Shown on model 638 ball neck stowage box in vehicle
Diameter of coupling ball
P31.11-0221-01
| Checking | ||
1.1 | Remove cover on bumper (A) | Only on model 638 | |
2 | Remove cover for ball neck mounting (B) | ||
3 | Remove ball neck from vehicle | ||
4 | Check diameter of coupling ball (arrows) | The ball neck must no longer be used if it measures less than the minimum size. | |
Minimum diameter of coupling ball | |||
5 | Check function of ball neck | Check automatic interlock for proper operation. | |
If there are problems, the ball neck must no longer be used. | |||
6 | Dismantle, unlock and lock ball neck | To unlock, pull the release lever outwards. | |
If ball neck and ball neck mounting are contaminated | |||
Trailer hitch with detachable ball neck - clean after testing | |||
7 | Lubricate ball neck and ball neck mounting | ||
| Automatic transmission fluids (ATF, Sheet 236.6) | Sheet 236.6 | |
| Automatic transmission fluids (ATF, Sheet 236.7) | Sheet 236.7 | |
| Automatic transmission fluids (ATF, Sheet 236.8) | Sheet 236.8 | |
| Multigrade engine oils (Sheet 228.1) | Sheet 228.1 | |
| Multigrade engine oils (Sheet 228.3) | Sheet 228.3 | |
| Grease (NLGI grade 1) | Sheet 266.0 | |
| Multipurpose grease (NLGI Class 2) | Sheet 267.0 | |
8 | Insert ball neck into stowage box/tray in vehicle | Fasten ball neck in place. | |
9 | Mount cover for ball neck mounting (B) | ||
10.1 | Mount cover on bumper (A) | Only on model 638 |
Test values for trailer hitch
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