NEW D-MAX /MUX /COLORADO FORUM

NEW D-MAX /MUX /COLORADO FORUM
It is currently Thu Nov 15, 2018 9:40 am

All times are UTC + 8 hours


We have NEW server almost ready, try it out here


Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Thu Mar 01, 2018 6:29 am 
Offline

Joined: Thu Mar 01, 2018 6:19 am
Posts: 1
Hi - The power steering pump has just failed on my 2016 Dmax (9700mls). As it seems to be driven directly from the engine (no belt) can there be any other damage? The truck has been recovered by the dealer and I await their report. Is this a common problem?
Thanks
cashwowud


Top
 Profile  
 
PostPosted: Thu Mar 01, 2018 10:12 am 
Offline

Joined: Sat Oct 12, 2013 5:36 pm
Posts: 1402
I have only heard of one other.
When you say it has failed, it may not have but it may have seized the pump vanes in the centre rotor due to the fluid never having been changed by the dealer. A scum does build up after a while and often dealers don't change the fluid or they just suck a bit out of the reservoir and claim it has been changed.
Scum in a Psteer system is the result of Scum who don't service properly.

Only when the reserviour is removed from the vehicle and washed out, and then refilled with fresh fluid and that circulated and the return flow from the rack is dumped into a drum and fresh is continually added while rack is lock to lock to exit used fluid from it too, has all the fluid been changed.

The pump used it's own developed pressure to ensure the pump vanes are forced outward to create a series of moving sized pressure chambers as it pump fluid.
It is my guess the pump has not failed as in destroyed, but is possibly gummed up and the vanes can't move outward.
Through disassembly that condition can be seen and maybe a clean and complete system flush will have you running again without requiring a new pump.
If it all goes again or even requires a new pump then when a complete flush has been done, add some Nulon auto trans additive, ie TEFLON to the fluid, the Teflon makes it all work smoother and less friction.

If the pump has failed and damaged internally, a good workshop WILL ensure all return fluid after the initial startup is immediately dumped into a bucket as the steering is driven form lock to lock to make sure any particles are flushed from the rack and valving and the crap doesn't go through the new pump.
Not sure how you get mechanics who have no idea to do this or religously observe a wise flushing prototcol. You can always discuss this with them to see if they agree with a wise procedure.


Top
 Profile  
 
PostPosted: Mon Mar 05, 2018 9:14 pm 
Offline

Joined: Sat Mar 04, 2017 2:51 pm
Posts: 32
Location: Hobart, Tasmania
My steering seems very very stiff at times in slightly sloped carparks trying to go full lock etc.. it feels like im hanging off an old kingswood. Fluid levels seem fine though. Think this issue could be linked with the pump?


Top
 Profile  
 
PostPosted: Tue Mar 06, 2018 5:47 am 
Offline

Joined: Sat Oct 12, 2013 5:36 pm
Posts: 1402
Ryan
The pressure of the pump is controlled by a relief valve and if it is stuck open but the pump is ok, then there will be low pressure in the system and harder steering.

If the pump is faulty, it may still make full pressure but at a slower rate. Iesome vanes stuck and not operational. So if steering slowly and it turns ok then it maybe the pump.

If the steering is heavy at most engine speeds then it points to the relief valve (prv) being stuck open.

Because nearly every service centre never properly or completely flushes the system gumming up of both pump vanes and/or relief valve can happen. A disassembly and clean can fix it all.

When fluid is cold and the engine is revved the relief valve will open more than when fluid is hot and thinner, therefore, if a bit dirty inside the relief valve can stick partially open and when hot the pressure is lower because the valve cannot is bleeding off fluid instead of allowing the pump to develop full pressure for steering power.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC + 8 hours


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group