STANDARD GRAVITY BOX TARP INSTALLATION MANUAL J. & M. Mfg. Co., Inc. P.O. Box 547 Fort Recovery, OH 45846 Ph: (419) 375-2376 Fax: (419) 375-2708 www.jm-inc.com (Rev.
ROLL TARP ASSEMBLY Front Back # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Description Tarp Crank Handle Small 1” x 1” 14 GA Square Tubing 1.25” x 1.
ROLL TARP ASSEMBLY B A C F E D G 2
SPRING RETURN ASSEMBLY 2 6 2 3 8 3 7 4 5 5 11 1 5 12 10 3 9 # 1 2 3 4 5 6 7 8 9 10 11 12 Description 1/4-20 X 1.0 Grade 5 Zinc Hex Bolt 1/4-20 X 1 1/2 Grade 5 Zinc Hex Bolt Roller Small Aluminum Spacer Square 1/4-20 Grade 5 Zinc Centerlock Nut Rectangular Plastic Spacer Short Plastic Spacer Spring Return Spring 3/8-16 X 3.
STANCE Back OCS (Opposite Chute Side) CS (Chute Side) Front 4
STEP 1 - HANGER 1.1 Mark two holes using the Hanger Bracket as a template and drill with a 3/8” drill bit. These holes should be centered on the back vertical face of the gravity box as low as possible. 1.2 Fasten the Hanger Bracket to the gravity box using two 3/8” x 1” serrated flange bolts and two 3/8” serrated flange nuts. 1.3 Fasten the Hanger Hook to the Hanger Bracket as shown above with a 1/2” x 1 1/4” bolt and a 1/2” locknut. This should not be tightened all the way.
STEP 2 - ENDCAPS ASSEMBLY 2.1 Aside from the gravity box, match up the holes on the Front Endcap Arch with the top Front Endcap Plate holes. 2.2 Install the Nylon Strip Opposite Chute Side (OCS) using 1/4” x 5/8” bolts and 1/4” serrated flange nuts. 2.3 Insert 1/4” x 1/2” bolts in the remaining holes. Fasten with 1/4” serrated flange nuts. 2.4 Repeat Steps 2.1 - 2.3 for the back endcap arch and plate.
STEP 3 - PLACE LIP LOCK AND ENDCAPS 3.1 Rest the lip lock OCS and centered on the top of the Gravity Box. 3.2 Rest the assembled front and back Endcaps in place. STEP 4 - ENDCAPS 440/540 & 680/760 Models 4.1 Using the lower holes on the front Endcap Plate as a guide, drill holes through the front using a 1/4” drill bit. 4.2 Insert 1/4” x 1/2” bolts and fasten using 1/4” serrated fange nuts. 4.3 Repeat steps 4.1 & 4.2 for the back Endcap. 250 & 385 Models 4.
STEP 5 - ENDCAPS CONTINUED 5.1 Use the four holes on the top of the front Endcap as a guide to drill four holes from the top using a 1/4” drill bit. 5.2 Insert 1/4” x 3/4” bolts and fasten with 1/4” serrated flange nuts. 5.3 Repeat Steps 5.1 & 5.2 for the back Endcap. STEP 6 - SPRING RETURN NOTE: This step is only pertains to 440/540 & 680/760 Models Install the Spring Return on the front of the gravity box using ten 1/4” x 3/4” self tapping bolts. Be sure the end with the cable loop is OCS.
STEP 8 - TARP BOWS 9.1 Position the Tarp Bows on top the Gravity Box. Be sure to spread the Bows out evenly from front to back. 9.2 Using the Tarp Bows as a guide, drill holes with a 1/4 ” drill bit. -NOTE: There may be existing holes in the Lip Lock for the bows. If these holes are not in the correct location, new holes will have to be drilled through the lip lock. 9.3 Insert 1/4” x 3/4” bolts and fasten with 1/4” serrated flange nuts. STEP 9 - CABLE 8.
STEP 10 - PLASTIC STANDOFFS Using 1/4” x 1 1/2” self tapping screws mount the Plastic Standoffs 2” below the drip edge and right up against the corner brace as shown on the left. STEP 11 - 1” SQUARE TUBE 2” 3/4” 11.1 Insert the 1” 14 ga Square Tube into the tarp sleeve on the opposite side of the stiffening patch (see pg. 11, Step 13 for a picture of the stiffening patch). 11.2 Center the 1” Square Tube inside the sleeve.
STEP 12 - STOP BRACKETS 14” CS 12.1 Center the 1” Square Tube that is riveted to the Canvas Tarp on the CS of the gravity box. Allow the Square Tube to hang below the top bolts on the corner brackets (around 2 1/2” below top of the Gravity Box). 12.2 Drill two holes around 14” from the end of the Tube through the Tubing and sideboard wall. A third hole should be drilled as centered on the tube as possible. Avoid drilling through the center brace inside the gravity box. 12.
STEP 14 - U-JOINT & CRANK HANDLE 14.1 Install the Universal Joint using two 3/8” x 2” bolts and two 3/8” locknuts. 14.2 Install the Crank Handle using one 1/4” x 2 1/2” bolt and one 1/4” locknut. -NOTE: Universal Joint may be pre-assembled to the Crank Handle.
ROLL TARP PART NUMBERS Model Specific Roll Tarp Parts Common Roll Tarp Parts Description Part No. Qty. Description Part No. Qty. 250 Roll Tarp Nylon Strip JM0001471 1 Stop Bracket JM0001494 3 Tarp Crank Handle Small JM0000889 1 Prop Up Bar JM0000917 2 1” x 1” 14 ga Square Tubing x 120” JM0001531 1 2 1.25” x 1.
