Service Kit Instructions
Series 40 - M46
Neutral start switch spool replacement procedure
OVERVIEW |
The rotary control spool in the M46 series variable pump wears with use, possibly |
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causing controllability problems in certain applications. A new induction hardened |
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control spool has been created that limits this wear. This procedure details the steps |
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to replaced this control spool in M46 models that have the Neutral Start Switch (NSS) |
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feature. |
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This procedure requires a spool replacement kit, Sauer-Danfoss part number 4510456. |
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reference Sauer-Danfoss publication BLN-9939 (M46 Service Manual). |
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PRELIMINARY NOTES: |
Thoroughly clean the pump control/NSS area of dirt and water. The introduction of |
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foreign material (dirt, sand, or water) reduces the life and controllability of hydraulic |
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Warning |
systems. |
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Make sure prime mover |
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(engine) is OFF. |
There are two pump control adjustments a ected by this procedure: pump neutral, and |
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the neutral-start switch function. Follow the adjustment procedure for pump control |
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neutral and NSS function, as outlined in the Final Adjustments section of this bulletin. |
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This procedure may be preformed with the pump in the vehicle. If there is less than |
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5 inches of clearance directly above the pump control assembly, the pump must be |
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removed from the vehicle. If possible, the two pump mounting bolts may be removed, |
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and the pump rotated to gain access. |
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If equipped, shut the isolation valve in the pump suction line from the reservoir. |
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Remember to reopen it before restarting the engine. |
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Ensure all parts of kit 4510456 are available and the new spool/cam assembly is properly |
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assembled. |
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REMOVAL OF SPOOL |
1. Disconnect the NSS switch (1236) at |
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1256 |
3/8 in |
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the quick-disconnect (A). |
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1213 |
1/2 in |
Removal of the pump |
2. With a 1/2 inch wrench, remove the |
1257 |
1235 |
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neutral adjustment bracket |
control handle locknut (1213) and |
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is not necessary during |
star-washer (1235). |
A |
1251 |
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this procedure. However, |
3. With a 3/8 inch wrench, remove the |
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as a precaution, mark the |
two cover screws (1256) |
1236 |
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position of the bracket. |
4. Remove the NSS/spool assembly |
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from the pump. |
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5. With a hammer, tap the spool/cam |
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1249 |
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assembly (1249) from the NSS |
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housing. Hold the control handle, |
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spring, and neutral adjustment |
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1255 |
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bracket in place during replacement of spool.
6. Remove the expansion plug (1257) by pressing it out from the inside.
© Danfoss, 2013 |
BLN-10249 • Rev AA • September 2013 |
1 |
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