Roper Dog Cam Replacement – Replace Worn Agitator Dogs/Cams
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Understanding the Problem
On many Roper (Whirlpool-family) top-load washers the small plastic 'dog' or cam pieces inside the agitator control the direction of the agitator and allow the basket to agitate properly. When those plastic dogs wear or break the washer may spin but not agitate, or it may agitate weakly or intermittently. Because the dogs are inexpensive and hidden inside the agitator, this is a common simple repair. The dogs sit in a cylindrical cam assembly under the agitator cap and engage the transmission’s drive when the drive shaft turns one direction. Over time the tiny teeth on the dogs shear off from normal use or from heavy/oversized loads, allowing the shaft to spin without turning the agitator. Replacing the worn dogs (sometimes sold as an agitator repair kit) typically restores full agitation and is a quick DIY job for most homeowners.
Common Symptoms
Washer spins but doesn't agitate; intermittent or weak agitation; grinding or rattling noise during agitation; agitator slips or turns freely by hand.
Common Causes
- Worn or broken plastic agitator dogs (directional cogs)
- Damaged agitator cam or drive hub that allows dogs to slip
- Heavy or unbalanced loads accelerating wear; age and plastic fatigue
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Run the washer on an agitator cycle and watch the top of the agitator while it runs. If the outer tub turns but the agitator doesn’t move (or only slides), odds are the agitator dogs are worn. You can confirm by removing the agitator cap, pulling the agitator, and inspecting the small plastic dogs for rounded or missing teeth.
Frequently Asked Questions
How hard is it to replace the agitator dogs on a Roper washer?
Not hard — for most top-load Roper washers it’s a straightforward DIY job: unplug the washer, remove the fabric softener cap (if present), remove the agitator cap/cover, unbolt and pull the agitator, replace the dogs/cam pieces and springs, reassemble. Typical time is 20–45 minutes for someone with basic tools. Always confirm the replacement part fits your model and follow safety steps (power off).
How much will parts and labor cost to fix worn agitator dogs?
Parts (agitator dog kits) are inexpensive — usually $10–40 depending on brand and seller. If you hire a technician, expect labor to add about $75–150 depending on travel and minimum service charge. Replacing the dogs yourself saves labor costs and is usually quick if you have the correct part.
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