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Topic: Hydraulic pump on last leg (Read 4142 times) previous topic - next topic

Re: Hydraulic pump on last leg

Reply #100 –
We made it to Memphis yesterday but not without incident. Got about a 1/4 mile from the campground and threw the hydraulic pump belt. Found a very unsafe place to pull over. :( No choice really the engine was hot and getting hotter. Luckily a guy in a pickup pull up behind us offering help and directed traffic around us while I worked on the coach. Decided the pulley's needed to be aligned better. Loosened the bolts on the hydraulic pump shaft pulley and used some percussion adjustment to move it onto the shaft a little further. Popped a new belt on and got running again.

Pulled into Flying J a few miles down the road for fuel and checked the belt. Looked good. On down the road we went. About 80 miles down I started noticing the engine temps were creeping up. Found an exit and pulled into a Texaco truck stop. Go back and check the pump and I see fluid seeping around the ORB fitting in the top of the pump. Pulled my wrenches to try and tighting but there was no way to get to the nut. The mounting bracket and other hoses were conspiring against me. About now visions of pulling the pump AGAIN are running through my head. Maybe it's time to call in Coach-Net. In an act of desperation I put the crescent wrench on the 90˚ elbow and cranked as hard as I could. Damn thing didn't budge. Pulled out one of the really big wrenches, slipped the box end over the end of the crescent and cranked again. Got it to turn about 45˚. Went into the Texaco and bought 2 gallons of Delo 15w-40 and refilled the hydraulic reservoir. Cranked the engine and no leak! :) Luckily I had enough slack in the hose that it didn't kink. It did cause it to rub against another hose but I covered the other hose with electrical split loom to prevent wear.

Got back on the road and drove to Winfield, AL about 120 miles down the road with lots of stops checking the pump making sure no more leaks. Yesterday we drove 150 miles to Memphis without a single problem! Yea!

This pump has been fighting me every single step of the way. The bright side of the story is that I'm pretty sure Kent isn't going to be asking to do any work on his coach anytime soon! :))

@Gary we plan to be out of Colorado 1st week of June so not likely we'll be able to meet up. :(

@Rick sorry I didn't get any spec's with the pump. I'd advise anyone looking for them to call the company with the part number.

@coastprt I've attached pics of the installed pump. Glad you mentioned it.

@MAZ It was great meeting you and Tanya. Hope we can meet up again down the road.

see ya
ken

The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X

Re: Hydraulic pump on last leg

Reply #101 –
Ken,

Thanks buddy for the pics on your new pump installed.  You now have become an expert on removing and replacing the hydraulic fan pump.  We all
can now defer to you in the future for advice on how to do this!  :)

I did notice from the pics that you used a 6 instead of an 8rib belt when the old one was thrown.  Did you check the alignment of the pulleys with a magnetic angle gauge and use an adjustment washer on the tensioner as Pierce has shown us how to do?  The PO on mine had a 6rib belt and I changed to an 8rib that is better for the pump and the pulleys. The system was designed for an 8rib belt (ask Dave M).  The 6 rib that was on mine was showing premature wear and fraying on one side .  If the pulley is off angle the fraying will happen so the pulley needs to be aligned properly for proper belt tracking.  I used a Gates K080450HD.  I've had no problems since and don't anticipate any for a long time. 

Good luck,

Jerry
The selected media item is not currently available.
Jerry and Cindy Maddux
1993 U300/36WTBI DD6v92TA
build 4271  "Miss Lou"
1995 suzuki sidekick 4x4 toad
Gulfport, Ms

"Pride of Ownership"

Re: Hydraulic pump on last leg

Reply #102 –
@Jerry I normally run an 8 rib belt but have a couple of 6 rib spares. Running the 6 rib until I'm sure the pulleys are aligned which they aren't. I put the belt on the center for the engine pulley and hydraulic pulley. After running for a while the hydraulic pulley jumps over one rib toward the pump. I'm going to try getting the pulley further onto the shaft but have to work up the will power to actually go work on it again. :)) I took Kent's advise and used the 6 rib belt instead of risking the pricy 8 rib belt. Thanks Kent!

see ya
ken
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X

Re: Hydraulic pump on last leg

Reply #103 –

Amazon has a not so pricy Gates Green Stripe K080450HD for $23.72 with free shipping over $25. Probably should have 2 anyway and this beats NAPA prices by about half. I ordered from another supplier but it took forever to arrive.

Gates K080450HD V-Belt : Amazon.com : Automotive

Imagine the cost in TP if you couldn't pull over and your DD overheated. :))

Will do a detailed photo alignment procedure for the tensioner and pump alignment after I finish bathroom remodel (house).

Pierce

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Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Hydraulic pump on last leg

Reply #104 –
@Pierce That is a good price. Nice find. Napa wants $39.99 for the same belt! Looking forward to your pump alignment tutorial.

see ya
ken
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X

Re: Hydraulic pump on last leg

Reply #105 –
Meant to add that I did use a straight edge to align the pulleys when I installed the pump pulley but the pump pulley is a little thinner than the engine pulley so that makes it a little off center when the straight edge is touching both.

see ya
ken
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X
 

Re: Hydraulic pump on last leg

Reply #106 –
Ken, good eyes! This is part of the problem. The tensioner alignment is usually the culprit. The belt should ride within an eighth of an inch of center on the roller. The vertical alignment must match the crank and pump pulleys. The horizontal alignment is a little harder to check but the roller should be in exact alignment with the other two pulleys. This is the biggest reason why some tensioners jump up and down at idle. The belt goes sideways a few thousands of an inch and the tensioner adjusts for the slightly different belt length. When the belt moves back, the tensioner moves to a new position. This all happens several times a second.

Another member's U300 had a tensioner so far out of position that the belt rode part way off the roller. The tensioner was the correct part number. The big steel tensioner/pump mount had been incorrectly positioned almost a half inch too far toward the front of the coach at the factory. The belt always rode against the edge of the crank pulley and showed fraying after just a short time.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)