STRUCTURALS 5540F/YB5515 SERVICE MANUAL
11-32
When lowering a load very slowly for precise positioning, no
oil flow actually occurs through the winch motor. The
pressure will build up to a point when the brake will release
sufficiently to allow the load to rotate the motor through its
own internal leakage. This feature results in a very slow
speed and extremely accurate positioning.
The friction brake receives very little wear in the lowering
position. All of the heat generated by the lowering and
stopping of the load is absorbed by the hydraulic oil where it
can be readily dissipated.
Repair
Removal
1. Remove the wire rope from the winch drum.
NOTE: Be sure hydraulic pressure is relieved in the winch
circuit before disconnecting any hydraulic lines.
2. Disconnect hydraulic hoses from the winch motor and
motor drain ports.
3. Securely fasten and overhead hoist to the winch
assembly. Remove the winch mounting hardware and
then remove the winch.
Legend For Figure 11-60
1.Sight Gauge 26.Output Spacer 52.Motor Support
2.Relief Valve 27.Thrust Washer (6) 53.*O-Ring
3.Capscrew (8) 28.Planet Gear (3) 54.Clutch Assembly
4.Bearing Support 29.Roller Bearing (6) 55.Capscrew (4)
5.*Sealg 30.Output Spacer 56.Lockwasher (2)
6.Ball Bearing 31.Spirol Pin (3) 57.Capscrew (2)
7.Retaining Ring 32.Planet Gear Shaft 58.Fitting
8.Drum Closure 33.Planet Carrier 59.Elbow
9.*O-Ring 34.Planet Primary Gear 60.Tee
10.*Seal 35.Roller Bearing (3) 61.Hose Assembly
11.Drum 36.Bearing Race (6) 62.Hose Assembly
12.Plug 37.Spirol Pin (3) 63.Fitting
13.Cable Wedge 38.Primary Planet Gear Shaft 64.Elbow
14.Spacer Bar 39.Primary Planet Carrier 65.Hydraulic Motor
15.Lock Washer (12) 40.Primary Spacer 66.Manifold
16.Capscrew (12) 41.Brake Cylinder 67.Capscrew (6)
17.Motor Side Plate 42.Spring (12) 68.Brake Valve Block
18.Base 43.Spring Spacer 69.Capscrew (2)
19.Support Side Plate 44.Pressure Plate 70.Manifold
20.Lockwasher (16) 45.Spacer 71.Capscrew (2)
21.Capscrew (16) 46.Backup Piston Ring
22.Thrust Washer 47.*Seal48.Brake Disc (8) * Seal Kit
23.Primary Sun Gear 49.Friction Disc (7)
24.Output Sun Gear 50.O-Ring
25.Thrust Washer 51.Backup Ring
Reference Only
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