1974 John Deere 450B track loader.
The Stanadyne injector pump had failed and was reason JD450B quit.
Removed the front nose, radiator, main hydraulic pump and timing cover.
Found injector pump gear and one balance shaft out of time.
At some point in this machine's life repairs must have been done to front of engine. Timing marks on pump were not correct when flywheel was at TDC mark.
Rebuilt water pump during this repair.All parts from John Deere dealer for water pump were less than $50 (2009 dollars).
Timed everything according to service manual, reassembled, bled fuel lines and the 4-219 engine fired right up.
Ergonomics/safety were definitely not a priority when the JD450B's hoe was designed and built. Real men used these backhoes, The hoe operator is perched up in the open on the "captain's chair".The operator becomes a clear target for every object (including attacking bees/hornets) the hoe's arm can reach.
Steering clutches (9 friction discs), pressure plate, release bearing, pilot bearing and brakes on both sides were replaced.
Pictures show various views of work as it progressed.
Drilling out cotter pin holes with frozen pins was about the most time-consuming task.Sandblasting clutch baskets before assembly helped when installing steel separator plates.Be sure to put one friction disk behind the snap ring on clutch hub.Clutches on right side of this tractor had been assembled incorrectly at some point before I owned it.
Someone had put all 9 discs in front of the snap ring. This explains why right side always slipped under a load.
The top brake return spring is difficult to attach if service manual instructions are followed. Spring was attached to brake shoe half, the other end was put in eyelet before bolting top cover on.
