Shop TWG Pullmaster HL25 Low Forward Rapid Reverse Hoists
The TWG Pullmaster HL25 is a high performance, high efficiency planetary winch with two forward speeds and one reverse speed. At low forward or hoisting speed, this unit has a line pull capacity of 25,000lb on the first layer of wire. In the 'rapid forward' mode, the line pull capacity is reduced by a ratio of 4.67 and the line speed increases by the same ratio. The change from low speed to rapid forward speed is actuated hydraulically and can be made while the drum is rotating.
Low Forward Speed:During low forward speed the output torque and rpm of the hydraulic motor is transmitted by the motor drive shaftto the primary sungear of the primary drive. The output torque and rpm of the primary drive is transmitted to thefinal drive by the final sungear, which is splined to the primary planet hub. The output torque and rpm of the finaldrive is transmitted to the cable drum by a spline, attaching the final planet hub to the cable drum.The motor drive shaft is splined to a clutch hub which connects to a set of friction and divider plates. During lowspeed operation, a pressure plate, which is "spring applied" and "pressure released", permits free rotation of thefriction plates.The motor drive shaft is also attached to a connecting shaft by a sprag clutch which permits free rotation of themotor drive shaft while the connecting shaft is stationary. The connecting shaft is held stationary by another spragclutch to a brake hub. During low forward speed operation, the automatic brake remains applied, hence, the brakehub, the connecting shaft and the internal gear do not rotate.
Rapid Forward Speed: When rapid forward speed is actuated, hydraulic pressure is channelled from the motor to the center bore of themotor drive shaft to the clutch piston. The hydraulic pressure causes the clutch to engage against the clutchsprings. The clutch hub is splined to the motor drive shaft and the drive gear is splined to the connecting shaft,the internal gear of the primary drive will rotate with the motor drive shaft. Thus, the planetary drive is eliminated.The elimination of the primary drive results in a forward or hoisting line speed 4.67 times faster than low forwardspeed. The line pull capacity during "rapid forward" operation must be decreased by a ratio of 4.67. When thepressure is removed from the clutch, the clutch is disengaged by the clutch springs and the unit reverts to lowforward speed. Since the sprag clutch, which connects the connecting shaft to the brake hub, permits freerotation, the automatic brake of the winch is not affected during rapid forward speed. The change over from low forward speed to rapid forward speed can be made while the drum isrotating, providing the load on the wire rope does not exceed 5357 lb (23.8 kN) on the first layerof wire rope. If this load is exceeded, winch will stall.
Rapid Reverse: When the hydraulic motor is pressurized for rapid reverse, the rotation of the motor drive shaft causes the spragclutch to lock, resulting in a solid assembly between the motor drive shaft and the connecting shaft. Rotation ofthe connecting shaft causes the sprag clutch between the connecting shaft and the brake hub to lock makinga solid assembly between these two components. Hydraulic pressure is automatically transmitted to the brakepiston, forcing the brake piston to release brake against a series of brake springs. The friction plates, which areengaged in the brake hub, can now rotate between the divider plates. Since both sprag clutches are locked, thefriction plates, brake hub, connecting shaft, internal gear and primary sungear turn at the same revolution as themotor drive shaft. Thus, the primary drive is eliminated, resulting in a reversing speed 4.67 times faster than lowforward speed.If a load on the cable drum tends to affect the reversing speed, the resulting pressure drop in the brake pistoncauses friction between the friction plates and the divider plates. Thus, a completely smooth reversing speed canbe controlled in a stepless operation by modulation of the winch control handle. When the control is returned toneutral position, rotation stops and the disc brake applies automatically. The pressure in the brake piston is ventedto the reservoir by the motor spool of the winch control valve.During reverse operation of the winch, or when a load is being lowered, the friction created by the brake discresults in temperature. On the standard Model HL25 this temperature is dissipated by a circulation flow ofhydraulic fluid, supplied from an external source (see HYDRAULIC CIRCUIT). For efficient cooling of theautomatic brake, the external circulation flow should be adjusted to 7 (US) gpm (26 l/min). This circulation flowmust be returned directly to the reservoir with a permissible back pressure of 30 psi (2 bar).
Style:
Type:
Cable Drum Dimensions (Standard Drum):
Cable Storage Capacity:
Max Operating Pressure:
Max Operating Volume:
Minimum Operating Volume:
Drum Torque at Max Pressure:
Drum RPM at Max Volume:
Hoisting Line Pull at Max Pressure:
Max Allowable Line Pull when Lowering:
Hoisting Line Speed at Max Volume:
Lowering Line Speed at Max Volume:
Allowed Back Pressure @ Motor Return Port:
Allowed Pressure at Circulation Supply Port:
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Planetary Hoists
Low Forward, Rapid Reverse
10" Barrel Diameter, 17" Flange Diameter, 11" Barrel Length
7/16" Wire Rope = 612ft
1/2" Wire Rope = 413ft
9/16" Wire Rope = 383ft
5/8" Wire Rope = 297ft
3/4" Wire Rope = 210ft
7/8" Wire Rope = 140ft
1" Wire Rope = 91ft
2500 psi (172 bar) for -86 Gear Motor; 3800 psi (262 bar) for -129 Piston Motor;
115 GPM (435 l/min) for -86 Gear Motor; 61 GPM (231 l/min) for -129 Piston Motor;
30 GPM (114 l/min) for -86 Gear Motor; 14 GPM (53 l/min) for -129 Piston Motor;
135,937 lb-in (15,359 Nm)
49RPM Hoisting, 229RPM Lowering
25,000lb Bare Drum, 16,860lb Full Drum
5357lb Bare Drum, 3778lb Full Drum
140fpm Bare Drum, 207fpm Full Drum
651fpm Bare Drum, 965fpm Full Drum
65psi
30psi
Click HERE to view the Pullmaster PL Hoist Brochure
Click HERE to view the Pullmaster PL Hoist Specs & Drawings
Click HERE to view the Pullmaster PL Performance Chart Data
Click HERE to view the Pullmaster HL25 Service Manual
Click HERE to view the entire PL/H Winch Collection
Shop Pullmaster HL25 Planetary Hoists
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- NOTE: Drum Storage based on Ø7/8" wire rope.
For safety, 5 wraps of wire rope must be maintained at all times.
PullMaster products are not to be used to lift, hoist or move people. If your task involves lifting or moving people, you MUST use the proper equipment; not a PullMaster product. Wire rope anchors on winches are not designed to hold the rated load of the winch. You must keep at least five (5) wraps of wire rope on the drum to insure the wire rope doesn't come loose. Stay clear of suspended loads and of wire rope under tension. A broken wire rope or dropped load can cause serious injury or death. Make sure that all equipment, including the winch and wire rope, is maintained properly. Avoid shock loads. This type of load imposes a strain on a winch many times the actual weight of the load and can cause failure of the wire rope or of the winch. Winch operators must be trained in the proper, safe operations of the winch. The hydraulic system should use only high quality hydraulic oils from reputable suppliers. These oils should contain additives to prevent foaming and oxidation in the system. All winch systems should be equipped with a return line filter capable of filtering 10-micron particles from the system. Please contact OneHydraulics if you need assistance with fluid selection.
Technical Specs
