Assembly Notes and Reorder Parts
Part No.
Descrip-
tion.
Side
cover Qty
Roller Qty
Roller
cage
Sheave Inner race
3355
1.5T
H-77970
2
MS-525 30
H-73941 MS-524 MS-556
3384
1.5T Wide H-77970
2
MS-525 30
H-73941 H-79261 H-79262
3356
3T
H-77965
2
MS-525 36
H-73780 MS-531 MS-557
3358
3T Wide
Tulip
H-77965
2
MS-525 36
H-73780 MS-544 MS-558
3357
5T
H-77652
2
MS-535 38
H-73939 MS-528 MS-559
3382
5T Wide
H-77652
2
MS-535 38
H-73939 MS-550 H-82256
3378
5T Wide
Tulip
H-77652
2
MS-535 38
H-73939 H-81894 H-81895
3379
6.5T
H-81290
2
MS-536 40
H-73977 MS-534 H-81289
3375
6.5T Wide
Tulip
H-81290
2
MS-536 40
H-73977 H-81573 H-81572
3377
8T
H-81615
2
MS-554 46
H-74985 MS-553 H-81709
3376
8T Wide
Tulip
H-81615
2
MS-554 46
H-74985 H-81614 H-81616
3380
12T
H-81309
2
MS-554 54
H-81308 H-81306 H-81307
3383
12T Wide
Tulip
H-81309
2
MS-554 54
H-81308 H-82265 H-82264
3385
16T
H-81765
2
MS-554 64
H-81767 H-81765 H-82411
3381
20T
H-81061
2
H-81062 66
H-81064 H-81061 H-81063
Sidecover
Roller cage with
rollers
Sheave
Inner race
Gently pry sidecovers off with fingers or screwdriver. Use palm or arbor press to press
sideplates in place after servicing.
Sheave Box Dimensions
The supporting sides of the
sheave box (A) should be:
.75mm larger than (B) the sheave
width +/- .25mm.
Short Term Maintenance
Flush sheave bearings with detergent and fresh water. Flush areas shown while rotating
sheave.
Cutaway view
A B
Flush parts with detergent and fresh
water. Clean and remove grease using
solvent. Lightly grease inner ring of
sheave as shown at right.
Annual Inspection and Maintenance
Disassemble sheave to inspect and
service. Gently pry off plastic sideplates.
Refer to exploded view below for
disassembly. IMPORTANT! Do not
force bearing cage. Remove rollers for
cleaning or replacement by pushing
outward. Install from outside pushing in.
V-Sheave Replacement Part Numbers
Do not exceed maximum working loads. Loads increase when the line turns at a greater
angle. Example: Sheave loads double when the line turns 180 degrees. Refer to block
loading formulas in Harken catalog. Center pin not included.
Sizing Sheave and Center Pin
