Anvil 9 #1 Posted 4 hours ago Good Morning All, Happy Thanksgiving to all. My question is this. I currently have a 1990 520 hydro and found a 2 stage blower model 79361. The serial number on the unit is 4900422. What I read was those models in that serial number range are for the 300 series WH's. I have installed single stage units on much earlier models and don't see much difference in the installation and operation of those. Does anyone have any thoughts or experience with the fitment to the 1990 520 hydro? Thank you in advance as I am considering pulling the trigger on this unit in the next 48 hours. Anvil Share this post Link to post Share on other sites
953 nut 62,560 #2 Posted 4 hours ago This chart should be able to provide the information you are looking for. Share this post Link to post Share on other sites
lynnmor 8,140 #3 Posted 4 hours ago It should fit just fine, the later charts from Toro ignored the later models since the 300 series continued for 10 years after the 520H's were discontinued. Share this post Link to post Share on other sites
JCM 10,342 #4 Posted 3 hours ago 1991 520-H with 44'' 2 stage # 79361 Share this post Link to post Share on other sites
Anvil 9 #5 Posted 1 hour ago Thank you both for your rapid responses. The chart is a miracle for those of us that mix and match components as well as searching for what fits what on the fly. Thanks again. Anvil Share this post Link to post Share on other sites
