Washer Motor Won’t Start? Start Capacitor 37377 – Fix Hum-No-Spin Fast
A washer that hums but won’t agitate or spin is almost always a failed start capacitor. In most Speed Queen washers, the start capacitor provides the initial electrical boost the motor needs to overcome inertia and begin rotating. When it fails, the motor receives power but cannot generate enough torque to start — resulting in a loud hum, tripped thermal overload, or complete motor shutdown. ⚡ Common failure point in Speed Queen and Alliance Laundry commercial and residential washers. Part 37377 is the genuine OEM replacement that restores full motor starting torque and gets your washer running again.
❓ Is This the Right Part?
This is the correct fix if ALL of the following are true:
- ✔ Washer powers on and fills with water normally
- ✔ Lid switch, timer, and controls appear to function
- ✔ Electrical supply to the machine is confirmed good
- ✔ ONLY problem is motor hums but drum won’t agitate or spin — or motor trips out immediately on start
Not sure? Send us your model number — we’ll confirm before you order.
🔧 Common Symptoms
- Washer hums loudly but drum does not move during agitate or spin cycle
- Motor starts briefly then cuts out on thermal overload
- Washer fills with water but stops before agitation begins
- Burning smell from motor area during attempted start
- Washer works intermittently — starts sometimes but not others
- Motor runs slowly or with reduced torque, not reaching full speed
✔ If these symptoms match, this is the most likely failed component in the system.
✔ In most cases, replacing this start capacitor restores normal motor operation immediately.
📦 Part Details
- Part Number: 37377
- Replaces: 60B1S110233NNAL
- Type: Washer Motor Start Capacitor — OEM
- Brands: Speed Queen, Alliance Laundry Systems
- Appliance Type: Residential & Commercial Washer
- Condition: Genuine OEM — New
While the motor is accessible, inspect the motor run capacitor and motor coupler (on direct-drive models). A weakened run capacitor often fails shortly after the start capacitor — replacing both at the same time saves a second service call. Also check the thermal overload protector on the motor: if it tripped repeatedly due to the bad capacitor, it may need replacement too.
⚙️ Installation
Skill Level: Moderate — 20 to 40 minutes. Disconnect power before servicing. Access the motor by removing the cabinet panels (front or rear depending on model). Locate the start capacitor mounted on or near the motor, discharge it safely before handling, disconnect the terminals, and swap in the new capacitor. Reinstall panels, restore power, and run a test cycle to confirm normal motor start.
✓ Compatible Models
Compatible model numbers to be confirmed — contact us with your model number before ordering to verify fitment.
💡 Pro Tip
Start capacitors can hold a dangerous charge even after the machine is unplugged. Before removing the old capacitor, short across its terminals with an insulated screwdriver or a resistor discharge tool. This takes 5 seconds and prevents a painful — or dangerous — shock. Never skip this step, even on a small capacitor.
✓ Model-Specific Repair Pages
✅Compatibility & Cross Reference
Not sure about your model number? Call 1-877-899-7278 and we’ll help you confirm. All brand names are the property of their respective owners and are used for compatibility reference only.
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