climer97007
Mechanical
- Jun 5, 2014
- 3
Hi all. Newbie here. I have a 1949 Dodge Power Wagon truck with an MU2 winch. The winch has a 29:1 worm gear input. The drivetrain has a NV4500 manual transmission with a 6 bolt PTO. The plan is to install a PTO driven hydraulic pump that drives a hydraulic pump into the winch worm gear input. I am trying to design and spec out the PTO, pump and motor. I want to turn the winch at about 20 RPM unloaded (Truck is rolling easily), and 10 RPM fully loaded (Truck is slipping, buried or stuck). The truck weighs about 6000 lbs.
As an example, the Milemarker H18K winch uses a 12 cubic inch motor to drive their winch. It has a two speed gear train, 18:1 or 6:1. I am wanting to do something similar but within the constrains of using the MU2 winch (29:1 gear drive). Their winch is supposed to work with 3 to 4 GPM PS Pumps.
Seems like 3GPM is too low to get the pull rate for my setup. I am wanting about 600 rpm on the hydraulic motor, for about 20 rpm on the winch drum. I am thinking that I can get away with a smaller displacement motor, since I have a higher 29:1 winch gear ratio. So, I am thinking of using a 6 to 8 cubic inch motor or so.
On the pump side, I am thinking that I need about 16 GPM to get 600 RPM out of the winch drive motor. I have a ton of questions about the pump and motor types, PSI ratings of each, etc.
I am looking at using a 2 stage Log Splitter pump rated at 3000 psi. The second stage kicks in above 900 psi. The flow doubles below 900 psi. However, the motors I have seen are not rated to 3000 psi? I don't really understand the full implications of the PSI ratings of the pumps and motors.
Can someone help me to spec out the right types of pump, motor, valving, etc? And offer me a Sanity check? Thanks.
As an example, the Milemarker H18K winch uses a 12 cubic inch motor to drive their winch. It has a two speed gear train, 18:1 or 6:1. I am wanting to do something similar but within the constrains of using the MU2 winch (29:1 gear drive). Their winch is supposed to work with 3 to 4 GPM PS Pumps.
Seems like 3GPM is too low to get the pull rate for my setup. I am wanting about 600 rpm on the hydraulic motor, for about 20 rpm on the winch drum. I am thinking that I can get away with a smaller displacement motor, since I have a higher 29:1 winch gear ratio. So, I am thinking of using a 6 to 8 cubic inch motor or so.
On the pump side, I am thinking that I need about 16 GPM to get 600 RPM out of the winch drive motor. I have a ton of questions about the pump and motor types, PSI ratings of each, etc.
I am looking at using a 2 stage Log Splitter pump rated at 3000 psi. The second stage kicks in above 900 psi. The flow doubles below 900 psi. However, the motors I have seen are not rated to 3000 psi? I don't really understand the full implications of the PSI ratings of the pumps and motors.
Can someone help me to spec out the right types of pump, motor, valving, etc? And offer me a Sanity check? Thanks.
