[dubdzine]

Hi guys, I am starting the rebuild of this 1998 Haas VF4. It has been mistreated in the past and would like to fix most issues with your help and learn from your experiences.
This is my first milling machine I would like to share what I have gone through with future Haas users.

Attachment 309808

I need some advice on how to:
1) Replace the Y axis linear guides. What would be the right procedure to replace and align the linear guides and trucks?
I was quoted $695 from Haas for one linear guide with 2 trucks (PN# 50-9011). The SN# on the runner block: 1651-432-10
It seems that I would need to change both guides and all trucks.

2) Purge way lube system and fix lines. There is no oil pressure (0 psi at the oil gauge). How can I purge the way lube lines? What would be a good warm up program to lube the bearing blocks and ball screws?

3) Replace way wipers (I have replacement wipers)

4) Fix low gear fault in transmission. I will get a low gear fault alarm 118 When homing all axes (air pressure 90 psi at main regulator, Secondary pressure reg at 20 psi when spindle is running). I can still home each axis individually and run the spindle at 1300 rpm, (any lower rpm, I will get a gear fault). UPDATE: I now get a 126 gear fault.

5) Flush transmission oil with Mobile DTE 25. (how to remove the old oil first, not just the over flow)

6) Fix the solenoid. If I remove the red clamp connector wire (purchased as is) I would get a Low Air Pressure Fault

7) replace the "removed" drive sprocket, the drive belt, and drive sprocket
Items # 72, 73, 74 pg 345 from the service manual
http://diy.haascnc.com/sites/default..._June_1998.pdf

8) Fix the chip aggar

9) Fix the coolant pump switch. It does not work from the panel. A separate switch is hardwired to the coolant pump for now. I believe the circuit in the main board is burnt.

10) Fix the door rail. I have to turn the Door hold override on when turning the machine on.


THE VF4 REBUILD TIMELINE (What I have done so far):

Powering the machine and installing air compressor
Attachment 309810

Removed, clean way covers and guards
Attachment 309812

Cleaned up the machine from old grease and chips
Attachment 309814 Attachment 309816

Attachment 309818 Attachment 309820 Attachment 309822

Replaced new air filter/regulator and Vactra oil No 2
Attachment 309826

Attachment 309830 Attachment 309832

Damaged Y axis bearing blocks and linear guide
Attachment 309834 Attachment 309840 Attachment 309836

If I remove the red clamp connector wire (purchased as is) I would get a Low Air Pressure Fault
Attachment 309842


Damaged teeth on the "removed" drive sprocket, the drive belt and drive sprocket
Attachment 309844

Gear fault alarms 118. Update: I now get 126 gear fault
Attachment 309838

I would love to hear everyone's opinion. Thank your for all your help!!

Marc

[agsy103]

2) to purge the oil lines, simply pull the knob up on the oil tank. Do no push it back down, it will return on its own.