Gloucestershire began at 12 for no wicket, 136 runs in arrears, and enjoyed an untroubled first half-hour.
But James Harris’s first ball accounted for Cameron Bancroft, lbw for 16, and in the next over Joe Phillips (28) turned Kellaway to short-leg where Asa Tribe took a fine reflex catch.
All-rounder Kellaway, 21, induced Ollie Price (22) to edge a drive to keeper Chris Cooke and Glamorgan still had victory hopes at lunch despite the Kookaburra ball.
Hammond hit successive boundaries to bring up his 50 off 94 balls and to take the Shire into the lead, before Graeme van Buuren (22) was trapped lbw by Kellaway after a stand of 56.
Gloucestershire looked fairly safe at 194-4 at tea, 46 runs ahead, but Kellaway struck twice in quick succession as he found increasing turn on the worn pitch to have both Hammond and James Bracey caught at slip.
Kellaway had Zaman Akhter leg-before for his first-ever six-wicket haul in a marathon effort, but Ben Charlesworth and Todd Murphy got the lead into three figures and that proved enough to salvage the draw.
Glamorgan kept themselves in the hunt for promotion with a positive draw thanks to the centuries from Kellaway and Colin Ingram, together with the bowling of Timm van der Gugten and Crane in the first innings, and Kellaway on the final day.
Crane’s injury was still to be assessed, but could prove a headache for the return to the T20 Blast.
Gloucestershire were left thankful for the last-wicket stand of 89 in the first innings between James Bracey and Archie Bailey, as well as their bowlers’ ability to put the brakes on Glamorgan on the third afternoon.
Glamorgan coach Richard Dawson told BBC Sport Wales:
“The lads have put in a serious shift today, Kellers with his spell backed up by the others and the fielders, the lads can be really proud.
“With the Kookaburra ball, you’ve got to be precise in your line and length, be patient and build pressure, and we were prepared to do that.
That’s a great experience for Ben to bowl 30-odd overs from one end at his age and take those wickets, and he controlled the scoreboard as well.
“With the bat, the way he managed his innings against a good attack, he batted really well supported by Col, it was pleasing how he built the innings.
“It’s close all through the table but I’m just pleased with the way we’re playing good hard four-day cricket.”
Gloucestershire captain Cameron Bancroft told BBC Bristol Sport:
“It’s been an arm-wrestle, we probably got out-played a little bit and Glamorgan played really well but we fought really hard today- there was one goal, to bat the day, and we were able to do that.
“It was challenging on days two and three when the wicket flattened out and didn’t offer as much sideways movement as the first morning, and big spin didn’t play much of a role until after lunch today, so we had to battle through, but I think a draw was a fair result.
“When you get to this stage of the season you want to be playing for something, there’s still a lot on the line for us so it’ll be exciting for us to get to Cheltenham.”
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