4400 straw walker bearings

Hi guys,
I am still new to my 1978 JD 4400 diesel combine. I have grease zirks on the rear straw walker wood block bearings, but can't find any on the front. Did they make them this way with out grease zirks on the front? I crawled over the top of the straw walkers and tried to peak down and look. I could see any. Do they hold up well with out grease? Thanks in advance for the help.
 

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