diff --git a/tubelib/command.lua b/tubelib/command.lua
index 2c79bf1..f60b077 100644
--- a/tubelib/command.lua
+++ b/tubelib/command.lua
@@ -508,7 +508,7 @@ end
 -- Data Maintenance
 -------------------------------------------------------------------------------
 local function data_maintenance()
-	print("[Tubelib] Data maintenance started")
+	minetest.log("info", "[Tubelib] Data maintenance started")
 	if Version == 1 then
 		-- Add day_count for aging of unused positions
 		for num,item in pairs(Number2Pos) do
@@ -526,27 +526,28 @@ local function data_maintenance()
 			if item.name then
 				Number2Pos[num] = item
 			-- data not older than 5 real days
-			elseif item.time and (item.time + 360) > day_cnt then
+			elseif item.time and (item.time + (72*5)) > day_cnt then
 				Number2Pos[num] = item
 			else
-				print("Position deleted", num)
+				minetest.log("info", "Position deleted", num)
 			end
 		end
 	end
 	-- collect unused node numbers
-	for idx = 1,NextNumber-1 do
+	for idx = NextNumber-1,1,-1 do
 		--FreeNumbers
 		local num = string.format("%.04u", idx)
 		if not Number2Pos[num] then
 			FreeNumbers[#FreeNumbers+1] = num
 		end
 	end
-	print("[Tubelib] Data maintenance finished")
+	minetest.log("info", "[Tubelib] "..#FreeNumbers.." numbers recycled")
+	minetest.log("info", "[Tubelib] Data maintenance finished")
 end	
 	
 generate_Key2Number()
 
--- maintain data after one minute
+-- maintain data after 5 seconds
 -- (minetest.get_day_count() will not be valid at start time)
 minetest.after(5, data_maintenance)
 
diff --git a/tubelib/node_states.lua b/tubelib/node_states.lua
index aca065a..0961949 100644
--- a/tubelib/node_states.lua
+++ b/tubelib/node_states.lua
@@ -358,7 +358,7 @@ function NodeStates:on_receive_message(pos, topic, payload)
 end
 	
 -- repair corrupt node data and/or migrate node to state2
-function NodeStates:on_node_load(pos)
+function NodeStates:on_node_load(pos, not_start_timer)
 	local meta = minetest.get_meta(pos)
 	
 	-- legacy node number/state/counter?
@@ -398,7 +398,7 @@ function NodeStates:on_node_load(pos)
 		else
 			meta:set_int("tubelib_state", STOPPED)
 		end
-	elseif state == RUNNING then
+	elseif state == RUNNING and not not_start_timer then
 		minetest.get_node_timer(pos):start(self.cycle_time)
 	elseif state == STANDBY then
 		minetest.get_node_timer(pos):start(self.cycle_time * self.standby_ticks)
diff --git a/tubelib_addons1/quarry.lua b/tubelib_addons1/quarry.lua
index 9c3dd71..7e37c83 100644
--- a/tubelib_addons1/quarry.lua
+++ b/tubelib_addons1/quarry.lua
@@ -459,11 +459,12 @@ tubelib.register_node("tubelib_addons1:quarry",
 			return "unsupported"
 		end
 	end,
--- Function has some negative impact on the cycle time for the 
--- cobble generator mode (5s on/5s off)
---	on_node_load = function(pos)
---		State:on_node_load(pos)
---	end,
+	on_node_load = function(pos)
+		local depth = M(pos):get_int("max_levels") or 1
+		-- If depth is 1, it is likely that the quarry is used as cobble generator,
+		-- controlled by a sequencer. If so, don't restart the timer.
+		State:on_node_load(pos, depth == 1)
+	end,
 	on_node_repair = function(pos)
 		return State:on_node_repair(pos)
 	end,