diff --git a/lib/galaxy/managers/datasets.py b/lib/galaxy/managers/datasets.py
index d82cd463cf4f..59c2283deb1e 100644
--- a/lib/galaxy/managers/datasets.py
+++ b/lib/galaxy/managers/datasets.py
@@ -52,7 +52,6 @@ class DatasetManager(base.ModelManager[Dataset], secured.AccessibleManagerMixin,
     Manipulate datasets: the components contained in DatasetAssociations/DatasetInstances/HDAs/LDDAs
     """
 
-    model_class = Dataset
     foreign_key_name = "dataset"
     app: MinimalManagerApp
 
diff --git a/lib/galaxy/managers/hdas.py b/lib/galaxy/managers/hdas.py
index a1103f45ff0f..432699ee643c 100644
--- a/lib/galaxy/managers/hdas.py
+++ b/lib/galaxy/managers/hdas.py
@@ -90,7 +90,6 @@ class HDAManager(
     Interface/service object for interacting with HDAs.
     """
 
-    model_class = HistoryDatasetAssociation
     foreign_key_name = "history_dataset_association"
 
     tag_assoc = model.HistoryDatasetAssociationTagAssociation
diff --git a/lib/galaxy/managers/hdcas.py b/lib/galaxy/managers/hdcas.py
index 76d5ef10cdab..65e0c2db3871 100644
--- a/lib/galaxy/managers/hdcas.py
+++ b/lib/galaxy/managers/hdcas.py
@@ -59,7 +59,7 @@ def set_collection_attributes(dataset_element, *payload):
 
 # TODO: to DatasetCollectionInstanceManager
 class HDCAManager(
-    base.ModelManager,
+    base.ModelManager[model.HistoryDatasetCollectionAssociation],
     secured.AccessibleManagerMixin,
     secured.OwnableManagerMixin,
     deletable.PurgableManagerMixin,
@@ -69,7 +69,6 @@ class HDCAManager(
     Interface/service object for interacting with HDCAs.
     """
 
-    model_class = model.HistoryDatasetCollectionAssociation
     foreign_key_name = "history_dataset_collection_association"
 
     tag_assoc = model.HistoryDatasetCollectionTagAssociation
diff --git a/lib/galaxy/managers/lddas.py b/lib/galaxy/managers/lddas.py
index 2b6018cb1a55..923e2f3ec01c 100644
--- a/lib/galaxy/managers/lddas.py
+++ b/lib/galaxy/managers/lddas.py
@@ -13,8 +13,6 @@ class LDDAManager(DatasetAssociationManager[LibraryDatasetDatasetAssociation]):
     A fairly sparse manager for LDDAs.
     """
 
-    model_class = LibraryDatasetDatasetAssociation
-
     def __init__(self, app: MinimalManagerApp):
         """
         Set up and initialize other managers needed by lddas.
diff --git a/lib/galaxy/managers/library_datasets.py b/lib/galaxy/managers/library_datasets.py
index 29005f42c651..c01251af7090 100644
--- a/lib/galaxy/managers/library_datasets.py
+++ b/lib/galaxy/managers/library_datasets.py
@@ -33,8 +33,6 @@
 class LibraryDatasetsManager(ModelManager[LibraryDataset]):
     """Interface/service object for interacting with library datasets."""
 
-    model_class = LibraryDataset
-
     def __init__(self, app: MinimalManagerApp):
         super().__init__(app)
         self.ldda_manager = LDDAManager(app)
diff --git a/lib/galaxy/managers/roles.py b/lib/galaxy/managers/roles.py
index 02448c1a4fbc..3c6ab434640d 100644
--- a/lib/galaxy/managers/roles.py
+++ b/lib/galaxy/managers/roles.py
@@ -37,7 +37,6 @@ class RoleManager(base.ModelManager[model.Role]):
     Business logic for roles.
     """
 
-    model_class = model.Role
     foreign_key_name = "role"
 
     user_assoc = model.UserRoleAssociation
diff --git a/lib/galaxy/managers/tools.py b/lib/galaxy/managers/tools.py
index c6dbe471dc84..054149cf24e2 100644
--- a/lib/galaxy/managers/tools.py
+++ b/lib/galaxy/managers/tools.py
@@ -30,11 +30,9 @@
     from galaxy.managers.base import OrmFilterParsersType
 
 
-class DynamicToolManager(ModelManager):
+class DynamicToolManager(ModelManager[model.DynamicTool]):
     """Manages dynamic tools stored in Galaxy's database."""
 
-    model_class = model.DynamicTool
-
     def get_tool_by_uuid(self, uuid: Optional[Union[UUID, str]]):
         stmt = select(DynamicTool).where(DynamicTool.uuid == uuid)
         return self.session().scalars(stmt).one_or_none()