Generac — Mechanical assembly of PMG - AG10
Installation · PMG (auxiliary exciter)
From a Generac service manual — check it applies to your exact model before use.
Browse Generac generators & specs →
Before you start
- Before starting the installation service of the auxiliary exciter (PMG) check that it cannot be driven by any manual or automatic system, isolating completely the alternator.
Procedure
- Withdraw the alternator exciter cover, to access the exciter rotor coupling bushing.
- Fit the PMG rotor in the main exciter rotor coupling bushing and fasten it through the internal hexagon headed screw M12.
- Withdraw the exciter cover shutter cover, withdrawing the 08 hexagon headed screws M6.
- Bind the connecting cables (3 and 4) of PMG with the polyamide clamp 6.6 in the back cover.
- Assemble and fasten the exciter cover with PMG through the 4 hexagon headed screws M10.
- Turn the alternator rotor with the hand to check that the installation is correct and that there is no part dragging.
- Perform the PMG electrical connection, according to item 14.3.2.
- Install the shutter cover, fastening it through 08 hexagon headed screws M6.
- Complete alternator with auxiliary exciter (PMG) and check the fastening torque of the screws.
Tools required
- polyamide clamp 6.6 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Internal hexagon headed screw M12: torque of 120 a 140 Nm with anaerobic chemical lock
- 4 hexagon headed screws M10: torque of 40 to 49 Nm
- 08 hexagon headed screws M6: torque of 8 to 10 Nm
- PMG connection cables tips (3 and 4) shall be taken to the alternator terminal box
Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.