The Cromex Tagline holds a grab steady regardress of boom angle while the grab and its load are suspended in air. The Tagline operation is completely automatic after installation.
The Cromex Tagline operates on a coil spring system that maintains constant, positive tension on a grab or other types of crane loads. The unit mounts on a crane boom and consists of a cable reel, cable wire, spring-loaded cylinders and a bell guide fairlead. Fairlead requires no sheaves, pins or lubrication.
Where applicable, safety precautions are included in paragraphs containing instructions on installation and disassembly procedures. Safety and maintenance data under normal oprational conditions is contained in a seperate section on page 6.
As shown on Fig 1. remove oil plug on barrel housing near cable reel and pipe plug on the end plate. Add oil until oil level lines up with plug hole on end plate.
Except for fairlead bracket and cable reel, the Tagline with cable reel is completely assembled before shipping.
The Cromex Tagline is designed to mount with cable reel on either side of the boom, or entire unit may be mounted within boom structure, depending on size of the tagline model and inside diamter of boom. Installation data for each type of mount is given below.
A. Mounting Tagline with cable reel outside boom
Lower crane booom and bucket to ground level. Materials for securing tagline to bomm: U bolts with plates, nuts and lock washers are located on tagline housing. Remove and use materials as shown in Fig. 9, Items 37 to 42.
Tagline unit should be loacted approximately 1/3 up from bottom of boom (Fig. 2, above) and set in position between upper and lower angels. Tagline mounts with cable reel on either side of boom, per instructions below.
SAFETY PRECAUTION: ALWAYS MOUNT TAGLINE ON OPPOSITE SIDE OF CRANE OPERATION CAB.
1. Mounting Cable Reel on left and right side of boom (Fig. 3, 4)
SSecure unit so that center edge of main end plate near perimeter of cable reel is on ground side and parallel to horizontal running edge of lowered boom structure. Fairlead bracket bolts to main end plate and points in direction of bucket (upper boom end). Secure bracket with four cap screws (Fig. 6, Items 35 & 28, page 9). Three bolt holes at opposite end of fairlead bracket provide choice of two positions for attaching bell cable guide. Use position that permits cable to travel smoothly back and forth through bell guide. Do actiones mirrored to secure Tagline to Right side of the boom (Fig.4)
2. Securing Cable To Bucket
SAFETY PRECAUTION: IF MORE INITIAL SPRING TENSION IS REQUIRED THAN PROVIDED BY THREE REVOLUTIONS OF REEL, USE TWO-MAN TEAM (FIG. 5). MAKE CERTAIN DOG RATCHET IS ENGAGED IN GEAR BEFORE PROCEEDING.
With tagline unit mounted on boom, either side, cable remains hooked in original position on reel. Engage dog ratchet by turning reel enough to drop ratchet in place in gear mechanism. Rotate reel counterclockwise a minimum of six complete revolutions from neutral position.
Unhook cable from reel and pass it through bell guide. Pull cable out along lowered boom and attach cable end to bucket.
SAFETY PRECAUTION: IF REEL HAS BEEN TURNED MORE THAN SIX REVOLUTIONS, TWO MEN SHOULD PULL OUT CABLE AND ATTACH END TO BUCKET.
Disengage dog ratchet by turning reel counterclockwise enough to release from gear mechanism. Unit is now functional and ready for pre-operation testing.
NOTE: UNDER CERTAIN OPERATING CONDITIONS MORE THAN SIX REVOLUTION OF INITIAL TENSION MAY BE NECESSARY. WITH GREATER INITIAL TENSION ON REEL, TWO MEN SHOULD BE USED TO PULL OUT CABLE AND ATTACH TO BUCKET.
Position crane boom over ground level at approximate 35° angle. Raise clamshell bucket to maximum height. Drop bucket to ground in fully opened position. Load and close bucket. Raise to height of not less than 4,5-5 m while swinging bucket through 45° arc. Drop load and return to original position. During test observe tagline operation to make certain crane hoisting and closing lines do not twist enough to cross over and foul operations. If tagline and bucket function smoothly without hindrance, unit is ready to work. Should twisting occur, additional tension will be required.
To Add Tension; Lower boom to ground level. Engage dog ratchet by turning reel enough to drop ratchet in place in gear. Using two man team, turn cable reel counterclockwise and release enough slack cable to allow one additional turn of cable around reel. IMPORTANT: REEL MUST BE HELD IN STATIONARY POSITION WHILE CABLE IS WOUND AROUND IT. Dog ratchet in gear accomplishes this, but reel may also be held in stationary position by hand. After completion of additional turn around reel, disengage gear mechanism by turning reel counterclockwise enough to release dog ratchet. Repeat pre-operation test. OPERATION INSTRUCTIONS Tagline operation is completely automatic after unit is installed and cable end attached to bucket. Tagline functions in conjunction with boom operation.