GMP JAMB SKID Manual
General Machine Products (KT), LLC www.gmptools.com Page 1 of 4
Copyright 2012 by General Machine Products (KT), LLC
All rights reserved. No part of this publication may be copied,
reproduced or transmitted in any form whatsoever without the
written permission of General Machine Products (KT), LLC
JAMB SKID
OPERATION & MAINTENANCE MANUAL
GMP • 3111 Old Lincoln Hwy • Trevose, PA 19053 • USA
TEL: +1-215-357-5500 • www.gmptools.com
July 13 2017 USA Ver 1a
Manual P/N 34654
P/N RANGE
70640 48” to 85”
70643 84” to 121”
70646 114” to 151”
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This equipment should be used only by personnel who have been given the appropriate training
and who are competent to use it.
These instructions are to be made available to operators of this equipment at all times. Failure to
observe these safety instructions could result in serious personal injury and/or property damage.
1. Lower the lower section of the Jam Skid into the manhole.
Rotate the locking foot pedal to the unlocked position
(figure A).
2. Align the center of the jam skid with the
center of the duct.
3. Lower the upper section into the man-
hole and install the upper section into
the lower section.
4. Raise the upper section so the swivel
bracket rests under the lip of the
manhole and the entire jam skid
rests at an angle of approximately
75° from the floor.
5. Install a locking pin to secure the 2
sections.
6. Using the 2nd locking pin install a
sheave or quadrant of suitable
size for the cable between the
jam skid legs and align with the
duct.
7. Secure the jam skid by moving
the base in or out slightly while
pressing down on the locking foot pedal until the locking
foot pedal fully engages (B).
unlocked
A
fully engaged
and locked
B
INSTALLATION
REMOVAL
1. Place leverage bar under
locking foot pedal and pry up
to release the Jamb Skid.
2. Remove the Jamb Skid by
reversing the installation pro-
cedure.
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70640 & 70643 rated @ 10,000 lbs.
70646 rated @ 5,000 lbs.
Maintenance
1. Before use, ensure that the Jam Skid is not damaged, bent or
twisted and all bolts are tight
2. Locking pins should be wiped with a light oil to prevent rust.
3. Jam skid should be cleaned of all mud and contaminates be-
fore storage.
4. Locking foot should be periodically greased to ensure smooth
operation.
Grease Fitting
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P/N Description
31356 Optional extension that allows the user to convert the height of the 70643 or
70646 to 48 in. to 85 in. (121.9 to 215.9 cm). Rated at 10,000 lbs. cable tension.
31357 Optional extension that allows the user to convert the height of the 70640 or
70646 to 84 to 121 in. (213.4 to 307.3 cm). Rated at 10,000 lbs. cable tension.
31358 Optional extension that allows the user to convert the height of the 70640 or
70643 to 114 to 151 in. (289.6 to 383.5 cm). Rated at 5,000 lbs. cable tension.
P/N Max. Cable Size Weight
84453 3 in. (76 mm) 60 lbs (27 kgs)
84454 4 in. (102 mm) 75 lbs (34 kgs)
84455 5 in. (127 mm) 90 lbs (40 kgs)
Quadrant Blocks
P/N WIDTH DIAMETER ROOT Weight
71723 3 in. (8 cm) 11 in.(28 cm) 8-1/2 in.(22 cm) 15 lbs.(7 kgs)
71726 4 in.(10 cm) 11 in.(28 cm) 7-7/8 in.(20 cm) 20 lbs.(9 kgs)
71729 5 in.(13 cm) 11 in.(28 cm) 6-7/8 in.(17 cm) 25 lbs.(11 kgs)
71722 3 in.(8 cm) 20 in.(51 cm) 17-1/2 in.(44 cm) 32 lbs.(15 kgs)
71725 4 in.(10 cm) 20 in.(51 cm) 16 in.(41 cm) 36 lbs.(16 kgs)
71728 5 in.(13 cm) 20 in.(51 cm) 16-1/2 in.(42 cm) 40 lbs.(18 kgs)
71721 3 in.(8 cm) 26-1/2 in.(67 cm) 24 in.(61 cm) 38 lbs.(17 kgs)
71724 4 in.(10 cm) 26-1/2 in.(67 cm) 22-1/2 in.(57 cm) 44 lbs.(19 kgs)
71727 5 in.(13 cm) 26-1/2 in.(67 cm) 23 in.(58 cm) 56 lbs.(25 kgs)
Cable Sheaves
Extensions – Note: only one extension can be used at a time. Do not stack
OPTIONS
