Posts

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Setting up MR329 without 3 dead turns

When teaching in the MR329 it isn’t required to set the 3dead turn parameter if the block will reach the ground before running out of rope on the drum.
If you previously set the 3 dead turn and need to get rid of the saved information on CSS, unpair the hook height encoder, pair it. Turn off CCS and turn it back on. Teach the zero height, and the upper height and then escape out of the teach in menu. A prompt will warn you on startup that 3 dead turns has not been set.

This is important because if you have a crane that reaches below the base of the crane the 3 dead turn function may preclude you from going low enough.

 

You can get around this if you want by pulling out rope onto the ground and setting the 3 dead turns but it may screw you on the next jobsite.  

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Potain HDT 80 hoist

HDT 80 hoist stopped working, cannot hear the brake releasing but contactor was pulling in lower left wire on rectifier was loose

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Crane load indication accuracy

1917.46(a)(1)(ii)

The accuracy of the load indicating device, weight-moment device, or overload protection device shall be such that any indicated load (or limit), including the sum of actual weight hoisted and additional equipment or “add ons” such as slings, sensors, blocks, etc., is within the range between 95 percent (5 percent underload) and 110 percent (10 percent overload) of the actual true total load. Such accuracy shall be required over the range of daily operating variables reasonably anticipated under the conditions of use.

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Hoist Drive Update

Hoist drive failed.  Instructions for drive replacement are in the folder, however it is required to add +24 vdc to DQ+.  This applies power to the hoist brake control relay.

See attached schematic.  Typically, the dotted lines are optional, but this is required.

ATV320 Hoist Drive MA21

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Frequency Drive

The new hoist frequency drives have only three speeds.

  • 1st speed  12.12
  • 2nd speed 35.09
  • 3rd speed 85.00

The Manitowoc hoist drive have five speeds.

  • 1st speed 12.12
  • 2nd speed 35.09
  • 3rd low speed 85.00
  • 3rd middle speed
  • 3rd high speed 125.00preset speeds
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Override button

Every HDT 80 with a serial number that starts with a 400 number has a override option.  If you overload your crane and you can’t hoist up or down because you overloaded the crane hold the start button down while hoisting down.

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Windshield washer check valves

While filling the washer bottle, all the fluid would leak out.

On the output side of each washer pump is a check valve. 

to access the valves the A/C unit must be removed.
found that the check valves were broken and cracked, presumably from freezing. Replaced the valves ( toyota part # 85321-26020) and washer bottle stays filled.

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HDT 80 hoist line for erection and dismantle

HDT 80    When erecting or dismantle make sure you have slack in your hoist line while folding the jib. It does not have auto winding on the hoist drum so it can get supper tight and there is no limits to stop it. click on the link to see in the manual where you need to make sure you have slack in your cable. It is best to have about 10 ft of slack in your cable.

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HDT 80 limit switches

While erection and dismantle there is no limit switches that will stop you.  Also there is no 125 limit for your hoist so you do not want to get your hoist rope tight at all or you will be bending and breaking stuff.