Dover TWG RUFNEK 50P Operating instructions

http://www.twg.com
SEL-0143-000
REV 0 JUNE 2014
RUFNEK 50P
Service/Repair Manual
DESIGN SERIES 001
TABLE OF CONTENTS
INTRODUCTION AND THEORY OF OPERATION.........................................................................................4
MAINTENANCE AND SERVICE....................................................................................................................5
RECOMMENDED OILS ................................................................................................................................6
OIL CHANGE...............................................................................................................................................7
DISASSEMBLY............................................................................................................................................8
MOTOR DISASSEMBLY..................................................................................................................................8
BRAKE SECTION DISASSEMBLY...................................................................................................................9
DRUM SECTION DISASSEMBLY..................................................................................................................10
CLUTCH INSPECTION .................................................................................................................................11
GEAR SECTION DISASSEMBLY...................................................................................................................12
INPUT PLANET SET DISASSEMBLY.............................................................................................................13
SECONDARY PLANET SET DISASSEMBLY ......................................................E RROR ! B OOKMARK NOT DEFINED .
OUTPUT PLANET SET DISASSEMBLY..........................................................................................................14
ASSEMBLY................................................................................................................................................15
OUTPUT PLANET SET ASSEMBLY................................................................................................................15
SECONDARY PLANET SET ASSEMBLY.............................................................E RROR ! B OOKMARK NOT DEFINED .
INPUT PLANET SET DISASSEMBLY.............................................................................................................16
GEAR END ASSEMBLY .................................................................................................................................17
DRUM SECTION ASSEMBLY........................................................................................................................18
BRAKE SECTION ASSEMBLY.......................................................................................................................20
MOTOR ASSEMBLY......................................................................................................................................22
TROUBLESHOOTING ................................................................................................................................23
TORQUE SPECIFICATIONS CHART...........................................................................................................24
BILL OF MATERIAL...................................................................................................................................25
CROSS SECTIONAL ASSEMBLY DRAWING...............................................................................................28
EXPLODED ASSEMBLY DRAWING............................................................................................................29
INSTALLATION DRAWING.......................................................................................................................30

2
FAILURE TO HEED THE FOLLOWING WARNINGS MAY
RESULT IN SERIOUS INJURY OR DEATH!
The safety of the winch operator and ground personnel should always be of great concern, and all
necessary precautions to insure their safety must be taken. The primary mover and the winch must
be operated with care and concern for the equipment and the environment. Additionally, a
thorough knowledge of the equipment and its performance capabilities must be understood. These
general safety guidelines are offered, however local rules and regulations or national standards may
also apply. Recommended references are, but not limited to, ANSI B30, OSHA 1910, AWS D 14.3,
and SAE J706.
Additional information can be found at http://www.team-twg.com/TulsaWinch/
Mounting:
Winch mounting must be secure and able to withstand the applied loads.
The stability of the mounting system must be approved by a qualified person.
All welding should also be done by a qualified person.
Winch mount must be flat so as not to induce binding.
The flatness must not exceed 1/16 inch across the mounting surface of the winch itself.
Guards must be placed on all open drives in the case of mechanical winches.
Insure that all PTO’s and drivelines are sized appropriately for the winch manufactures speed and
torque specifications.
Indicates an imminently hazardous situation
which, if not avoided, will result in death or serious
injury.
Indicates a potentially hazardous situation which,
if not avoided, could result in death or serious
injury.
Indicates a potentially hazardous situation which,
if not avoided, may result in minor or moderate
injury or property damage.
Indicates information or a company policy that
relates directly or indirectly to the safety of
personnel or protection of property.

3
Operator:
Must read and understand the operating and service manual.
Both the SERVICE MANUAL and OPERATING AND MAINTENANCE MANUAL are
available online at http://www.team-twg.com/TulsaWinch/
Must never lift or move people with this winch.
This winch is not designed or intended for any use that involves moving people.
Must stay clear of the load at all times.
Ground personnel should remain a safe distance from the load and winch cable- at least 1 ½
times the length of cable measured from the winch to the load.
Must stay clear of the cable at all times.
A broken cable can cause serious injury or death.
Must avoid shock loads.
Shock loads can impose a strain on the winch that can be many times the design rating.
Must be aware of the fleet angle of the winch.
All loads should only be pulled with the load line perpendicular to the drum shaft; this is to
avoid excessive stresses on the winch and will help prevent the cable from building on one
side of the drum flange.
Must wear personnel protective equipment (PPE) if required.
Check the local, state and federal regulations for compliance.
Must insure that the drum clutch is fully engaged before hoisting.
A visual inspection of the drum clutch engagement is required before each winching
operation.
Must rig all loads secure before winching.
Pull the load line taut and inspect the condition of load for stability.
Must inspect the drum brake.
The drum brake is not a load holding device. It is designed to prevent over spooling of the
drum, causing the cable to bird nest on the drum. Inspect the brake band for worn lining
and the actuation method.
Must inspect the load control brake.
This winch is equipped with a form of dynamic braking. The worm brake is adjustable for
pay-out load control. Before a load is handled the load should be pulled tight and stopped to
check this brake.
Operation:
All winch controls must be well marked for function to avoid confusion.
Insure that the PTO is disengaged when the winch is not in use.
All winch controls must be located to provide the operator with a clear view of the load.
The clutch must be inspected daily for proper operation.
The winch cable should be inspected daily for serviceability.
A minimum of five wraps of tightly wound cable must remain on the drum.

4
INTRODUCTION AND THEORY OF OPERATION
The Rufnek series planetary winch is designed to use a high-speed gear motor, driving
through a multiple disc brake, through three planet sets to the cable drum.
The multiple-disc brake is spring applied and hydraulically released through a port in the brake
housing. During inhaul, the brake is not released since the load is driven through the one-way cam
clutch, bypassing the brake. When the load comes to a stop, the cam clutch locks up and the load
is prevented from moving by the brake.
The brake and brake valve receives its signal any time the winch is in pay out. With the
brake fully open at about 340 PSI the brake valve will open and dynamically control the lowering of
the load.
ASSEMBLY NUMBER EXPLANATION
This manual is for design series 001. In the case of a major design change implementation, a new
design series designation number will be issued for the winch. A new manual will also be created for that
specific design series.
MODEL CODE
82438 001
A
SSEMBLY # SERIES
DESIGN
Gear Type
W=Worm
P=Planetary
Drive Type
H=Hydraulic
M=Mechanical
Gearbox Position
L=Left
R=Right
(viewed from rear of truck)
Input Shaft Location
F=Front
R=Rea
r
X=Does not apply
(viewed from rear of truck)
Cable Spooling
O=Over Drum
U=Under Drum
(viewed from rear of truck)
Clutch Device
M=Mechanical
A
=Ai
r
Motor Type
1. Single Speed Gear Moto
r
2. Two Speed Gear Moto
r
3. Single Speed Geroler Moto
r
4. Two Speed Geroler Moto
r
5. Piston
6. Vane
X. No Moto
r
RN50 P HRXOA2

5
MAINTENANCE AND SERVICE
For safe and consistent operation of TULSA WINCH hoists, swing drives, and winches, a regular
program of preventive maintenance is strongly recommended. Regular oil changes with the correct
oil for the ambient temperature conditions and an annual inspection of the wear components will
help ensure a long life for your planetary geared products.
Tulsa Rufnek series planetary winches, like any other piece of machinery, need to be periodically
serviced and well maintained to insure proper operation.
Good maintenance consists of four steps.
1. A daily inspection to insure that there are no oil leaks present and that all mounting bolts
and other fasteners are tight, and that the wire rope is in good condition.
2. Changing the oil in both the gearbox and the brake section.
(Severity of use will determine
the need for oil changes but it should be checked at a minimum of every 500 hours. Factors
such as extremely dirty conditions or widely varying temperature changes may dictate even
more frequent servicing)
.
3. Lubing drum bushings and sliding clutch with grease thru grease fittings located on drum
barrel and clutch.
4. Complete teardowns and component inspections.
(Again, severity and frequency of use will
determine how often this should be done)
. If the equipment that this winch is mounted to is
subject to standards for this type of inspection, then those standards must be followed. If
oil changes reveal significant metallic particles then a teardown and inspection must be
made to determine the source of wear.
OIL LEVEL MAINTENANCE
Tulsa Winch recommends that the oil level in the gearbox and brake housing be checked and
adjusted as part of the pre-use inspection. If the oil level drops frequently or oil leakage is
detected during an inspection, maintenance should be performed to correct any problems.

6
RECOMMENDED OILS
FOR STANDARD TEMP APPLICATIONS -10˚F THRU 150˚F (-23˚C THRU 66˚C) oil temp.
*Gearbox oil (GL-5):
Any GL-5 75W-90 Oil
FOR LOW TEMP APPLICATIONS -40˚F THRU 180˚F (-40˚C THRU 82˚C) oil temp.
*Gearbox oil (GL-5): Shipped from the factory filled with Mobilube SHC SAE 75W-90
synthetic gear oil
*All gearbox oils must meet MIL-PRF2105 & GL-5 specifications.
OIL CAPACITY
GEARBOX 7 QTS
BRAKE .25 QTS
Do not use EP type gear lubes in the brake section of this winch. EP lubes
may prevent the clutch from locking up, which, in turn causes the load to fall,
resulting in property damage, personal injury, or death.
The hydraulic system should use only high quality hydraulic fluid from reputable suppliers. These
oils should contain additives to prevent foaming and oxidation in the system. All hoist hydraulic
systems should be equipped with a return line filter capable of filtering 10 micron particles from the
system.

7
FIG 1
FIG 2
OIL CHANGE
The oil is drained by removing the drain plugs (81 & 86) located at bottom of gear housing (60)
(Figure 1) and bottom of brake cover (2) (Figure 2).
Then remove the fill plugs (81, 74 & 75) located at the top of the gear housing (3) and the top of
the brake cover (2). Inspect the oil for signs of metallic particles and/or burning and dispose of in a
proper manner. Then re-install the drain plugs.
Fill the brake end with 75W-90 (1/4 quart), then fill the gear end 75W-90 oil (7 quarts) and replace
both of the fill plugs.
See Oil Chart Pg. 6 this manual for recommended oil type and grade for your
application.

8
DISASSEMBLY
MOTOR DISASSEMBLY
1. Drain the oil from the brake assembly by removing the plug (81) from the bottom of the brake
cover (2).
2. Remove hoses (42, 45, 58, 79, & 80).
3. Remove the counterbalance block (32) and the manifold block (56), from the motor (1) by
removing the four cap screws (88).
4. Remove the motor (1) from the winch by removing four capscrews (88).
5. Remove the counterbalance valve (50) from the counterbalance block (32) and inspect the
metering hole to make sure it is not obstructed. Also, inspect the o-rings on the valve to insure
that they are not flat or cut. Replace if necessary.
6. Motors and counterbalance valves are not serviceable in the field. Return them to an authorized
dealer for service.
7. Inspect o-rings (98) & (49) for damage.

9
BRAKE SECTION DISASSEMBLY
1. Evenly remove the four capscrews (3) that hold the brake cover (2) in place. Spring pressure
will raise the cover up as the cap screws are loosened. Carefully remove the cover (2) from the
brake housing (20). Inspect the o-ring (6) for damage.
2. Remove the springs (7) from the piston (5) and check the free height. Each spring should
measure at least 1.094 inches with no force on them.
3. Remove the piston (5) by installing two pieces of 3/8”-16NC all thread into the two holes in the
top of the piston and run in evenly until the piston is clear of the housing. An alternative
method of removing the piston is to use shop air to slowly pressurize the brake port to remove
the piston from the brake housing (20).
4. Inspect the o-rings (8, 10) and back up rings (9, 11) on the piston. Grasp the brake
driver/clutch assembly (assembled items 14, 17, 18, 19, 52) and remove it from the brake
housing.
5. Remove the stator plates (12) and friction discs (13) from the brake housing and check them for
excessive wear, and replace if necessary. Be sure to check the top stator plate for scoring
caused by the removal of the piston and polish if needed. Friction discs should measure no less
than .055-in. thickness and stator plates should measure no less than .068-in thick.
6. To disassemble the brake driver/clutch assembly, remove the retaining ring (17) from either end
of the driver. Then, remove the brake driver (14) and bearing (52) from the input driver (19).
Next, remove the sprag clutch (18). Finally, remove the retaining ring (17) from the other end
of the driver, then remove the second bearing (52) from the input driver.
Notice the direction of lock-up on the clutch (18) for re-assembly.
7. Remove the bearing housing (16) and inspect the bearing (15).
8. If the bushing or seal in the brake housing needs to be replaced, follow the drum section
disassembly and reassembly sections of this manual prior to reassembly of the brake.

10
DRUM SECTION DISASSEMBLY
1. To remove the drum, first disconnect the cable from the U-bolt (35) and lay aside. If removing the
drum from the motor end with the motor and brake disassembled, first remove the cotter keys (93)
and clevis pins (100) connecting the yoke (87) to the bracket (101) and air cylinder (67).
You may need to remove the airlines, mark them for re-assembly.
2. Support the weight of the drum with a hoist. Remove the four cap screws (61) along with the
nuts and washers (62, 63) on the bottom of the brake housing (20). Disconnect the airline
running from the air cylinder (67) to the brake housing (20). Remove the brake housing by
sliding the housing off of the output shaft (40-9). At this time you will need to remove the two
cap screws (70), nuts and washers (71 & 72) from the frames (64 & 65). Do not remove the air
cylinder (68) yet. Disconnect the airline from the backside of the brake housing (20) that goes
to the brake band air cylinder. You can now remove the brake band assembly (66). Note which
frame the mounting bolts are on for re-assembly. Inspect and replace if needed.
3. Remove the outer thrust collar (105) by loosening three set screws (89).
4. Remove the yoke (87) and sliding clutch (27). Next remove the coupler (30) from the output
shaft (40-9). Remove the two keys (94) and the inner thrust collar (24). Remove the drum
using a hoist. Inspect the bushings (31) in both ends of the drum.
You should inspect the bushing and seal (38, 25) that are located
in the end of the brake housing
5. Inspect the drum clutch (28) by removing the six capscrews (33) from the drum. Replace the
clutch if necessary (See Clutch Inspection on page 11). Torque the capscrews to the specified
torque upon re-assembly. (See torque specifications chart on page 25 of this manual.)
6. Inspect the grease tube (115) and fittings (113, 114) inside the drum for wear or damage,
replace if needed.