03G-3 A500359 Chain Shaft Guide Bushing OD23mm ID17mm Bottom OD38mm H21mm 51.4g Spares for Power Feeder MX48

Replacing a worn chain shaft guide bushing on an MX48 power feeder takes one 51.4 g part, not a gearbox. The 03G-3 A500359 bushing runs 23 mm outside and 17 mm inside, 21 mm tall, with a 38 mm bottom face stepping down onto a 23 mm body. Two reference numbers, 03G-3 and A500359, one bushing. It holds the chain shaft concentric so feeding pressure stops drifting, and it wears instead of the shaft or the housing. Check those four numbers against the old part before you order.

A power feeder that has lost its chain shaft guide tells you early: the feed drifts on the same board, the chain runs slack on one pass and tight on the next, and the shaft starts to polish its seat oval. Shops then pay for a feeder assembly, a gearbox strip-down, or a generic 17 mm bushing with no 38 mm bottom step. The 03G-3 A500359 removes all three.

It is the replacement chain shaft guide bushing for the MX48 power feeder, listed under two reference numbers, 03G-3 and A500359. The body runs 23 mm outside and 17 mm inside, the bottom face is 38 mm across, height is 21 mm, one piece weighs 51.4 g in wear-resistant alloy. The 17 mm bore takes the chain shaft; the 38 mm bottom against the 23 mm body leaves a 7.5 mm radial step, which is what stops the part sliding through the bore.

Because it sits in contact with the guide seat, the bushing is the part that wears. Held concentric by a 17 mm bore and a 38 mm step, the chain shaft keeps its line: vibration drops, the housing stops wearing oval, and the drive keeps feeding without pressure falling away mid-board. The repair then costs a 51.4 g bushing, not a shaft, a housing or a gearbox.

Every figure below is a dimension you can check against the worn part in your hand before you order.

• 23 mm outer diameter. Body OD 23 mm matches the guide bore in the MX48 housing, so it seats without a shim.
• 17 mm bore. ID 17 mm is the chain shaft size; it runs concentric, not on one side of the bore.
• 38 mm bottom face. A 38 mm bottom against a 23 mm body gives a 7.5 mm radial step that sets seating depth.
• 21 mm height. H 21 mm spans the guide seat in one piece, so the shaft is supported over its full contact length.
• 51.4 g per piece. One bushing weighs 51.4 g, cheap to stock by the pair and to post.
• Two reference numbers. 03G-3 and A500359 both resolve to this bushing, so the parts list and manual agree.
• Wear-resistant alloy body. It is the sacrificial part: it takes the rubbing so the shaft and the housing do not.
• Guide duty, not fastener duty. It holds the chain shaft steady, which cuts vibration and misalignment in the drive.
• Drop-in fit. Old bushing out, new one in. No reaming, no glue, no machining of the housing.
• MX48 specific. Specified for the MX48, not a universal 17 mm bushing sold as fitting every feeder.

The choice is usually between two bad options: strip the gearbox for a worn guide, or run a generic bushing with the wrong bottom. A 51.4 g bushing shortens that decision.

• You repair the guide, not the gearbox. A worn 23 mm bushing is replaced on its own, so the shaft, the housing and the gearbox stay where they are, with no strip-down and no alignment fixture.
• The 38 mm step does the locating. A plain 17 mm bushing slides through the bore; the 38 mm bottom stops this one where the MX48 housing expects it.
• Feeding pressure holds through a batch. With the shaft held concentric, the feeder grips the first board and the hundredth board the same way.
• Spares that fit a drawer. At 51.4 g and 21 mm tall, two or three bushings cost almost nothing to stock and end the next emergency order.
• No fitment gamble. Four numbers decide it: 23 mm OD, 17 mm ID, 38 mm bottom, 21 mm height. Measure, compare, order.
• Two ways to order it. Quote 03G-3 or quote A500359; both are the same 51.4 g bushing, so a parts list and a machine manual point at one part.

Yes, if your feeder is an MX48. The bushing is listed for the MX48 power feeder at 23 mm OD, 17 mm ID, 38 mm bottom and 21 mm height. Check those four figures on the worn part before ordering, because a feeder from another series will not share them.

No. They are two reference numbers for the same chain shaft guide bushing. The part sits in the spare parts list as 03G-3 / A500359, so whichever number your manual or your parts list shows, it resolves to this one 51.4 g bushing.

Measure the old bushing on four axes: 23 mm outside, 17 mm inside, 38 mm across the bottom, 21 mm tall. A caliper on the worn part is enough. If the outside reads well under 23 mm, the bushing is simply worn, which is the normal reason to replace it.

It is the locating step. The body is 23 mm, the bottom is 38 mm, so the part has a 7.5 mm radial shoulder that stops it travelling through the guide bore and sets its depth in one movement. A plain straight bushing has no such stop.

No. A generic 17 mm ID bushing matches the bore but not the 38 mm bottom or the 21 mm height, so it will not seat at the same depth in the MX48 housing. Match all four numbers, not the bore alone.

No. It is a drop-in part: the old bushing comes out of the housing, the new one goes onto the chain shaft seat and back into the bore. No reaming, no bushing glue, no machining, so the repair does not need an outside machine shop.

Usually not. The bushing is the wear part by design, so it takes the rubbing and the shaft stays protected. Replace the 51.4 g bushing first, and look at the shaft only if drift and vibration survive the new part.

Quoted per order. The listing price line reads contact us for a quote, so MOQ, lead time and packing are confirmed with the quotation rather than fixed on this page. Send the quantity you need with the part number 03G-3 / A500359.