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Hydraulic Winch Design for 1949 Dodge Power Wagon

Hydraulic Winch Design for 1949 Dodge Power Wagon

Hydraulic Winch Design for 1949 Dodge Power Wagon

(OP)
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.

RE: Hydraulic Winch Design for 1949 Dodge Power Wagon

PTO gear ratio or pto rpm to engine rpm? This determines how fast the pump will run and at what engine rpm. Say run the engine at 1800rpm, what will the pump rpm be? Too large a pump and the engine will lug or stall. Know the pump rpm and displacement, you can calculate the flow at that rpm.
A relief valve will keep the pressure from exceeding the pump rating.

Ted

RE: Hydraulic Winch Design for 1949 Dodge Power Wagon

(OP)
Ted,
I want 600 rpm on the winch motor shaft to drive the winch to 20 rpm. The diesel engine idles around 700 rpm and red lines at 2400 rpm. So, I'd like to run the winch at engine idle most the time, and maybe up to 1500 engine rpm if more winch rpm or power is needed. I have no idea what the relationship is between engine rpm and PTO rpm. For example, does the PTO rpm stay constant with engine rpm or does it vary with the drive gear chosen in the 5 speed transmission? For example, does the PTO reverse direction if the put the transmission in reverse? So many questions...

RE: Hydraulic Winch Design for 1949 Dodge Power Wagon

(OP)
Ted, is that an amazing coincidence or what!? Just what the doctor ordered! Thanks!

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