Brand: 
GUA8 Universal Joint 27×74.6 GUA-8 Weasler AB4 / AW21 Series Power Take Off App
$10.83
50 in stock
Description
GUA8 universal joint cross, AW21 series, 1.062″ cap diameter — replacement u-joint for PTO App applications.
Full Description
Precision U-Joint: GUA8 (AW21 Series, 1.062" Cap)
The GUA8 universal joint cross is precision-ground to AW21 series standards -- 1.062" cap diameter, 2.937" overall width -- for use in Weasler AW21 / AB4 series power take-off (PTO) applications. The cross body is heat-treated alloy steel; needle roller bearings are retained in hardened steel caps sealed with elastomer trunnion seals. Lubrication design: greaseable (zerk fitting included).
Specification Data
| Item | Spec |
|---|---|
| Part Number | GUA8 |
| U-Joint Series | AW21 |
| Cap Diameter | 1.062" |
| Overall Width | 2.937" |
| Style | OSR |
| Lubrication | greaseable (zerk fitting included) |
| Manufacturer | UDS |
| Application Note | PTO App |
Needle Bearing Construction
Each of the four caps houses a set of needle roller bearings running on a hardened trunnion surface. The trunnion hardness depth must exceed the needle contact zone to prevent brinelling under shock loads. These crosses are manufactured to SAE standards for the AW21 series -- cap bore and trunnion dimensions are interchangeable with all OEM and aftermarket AW21 yokes.
Application: Weasler Aw21 / Ab4 Series Power Take-Off (Pto)
The AW21 series is the correct specification for Weasler AW21 / AB4 series power take-off (PTO) driveshafts. If you are unsure of your series, compare the cap OD on your old cross to the 1.062" dimension -- or measure your yoke cap bore ID directly. Series must match at both the yoke bore and the cross cap.
Operating Angle
U-joint crosses should operate at angles between 1 and 3 degrees for smooth power transfer and maximum life. Angles above 5 degrees cause cyclic velocity variation (second-order vibration) and accelerate needle bearing fatigue. If your driveshaft angle exceeds 5 degrees, consider a double-cardan (CV) joint arrangement instead.
PTO App
New to U-joints? See our universal joint guide for styles, snap-ring types, and measuring tips.
Additional information
| Series | AW21 |
|---|---|
| Style | OSR |
| Cap dia 1 | 1.062 |
| Width 1 | 2.937 |
| Lube | Yes |
| Brand | UDS |
| Notes | PTO App |
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