diff --git a/MConnectSDK/Enums.cs b/MConnectSDK/Enums.cs
index 3108633..e21fd77 100644
--- a/MConnectSDK/Enums.cs
+++ b/MConnectSDK/Enums.cs
@@ -20,8 +20,8 @@ namespace MConnectSDK
     public enum MAINTENANCE_TYPE
     {
         EXP_DATE = 0,
-        MACHINE_INTERVAL = 1,
-        TIME_INTERVAL = 2
+        MACHINE_INTERVAL = 1, //ACTIVE_TIME
+        TIME_INTERVAL = 2 //HOUR
     }
 
     /// <summary>
diff --git a/MConnectSDK/Maintenance.cs b/MConnectSDK/Maintenance.cs
index 0708dd3..92087e1 100644
--- a/MConnectSDK/Maintenance.cs
+++ b/MConnectSDK/Maintenance.cs
@@ -180,78 +180,6 @@ namespace MConnectSDK
             public OP_TYPE Type { get; set; } = OP_TYPE.ORDINARY;
 
             #endregion Public Properties
-
-            #region Public Methods
-
-            /// <summary>
-            /// Get list of all operation for current machine
-            /// </summary>
-            /// <param name="OperationsList"></param>
-            /// <returns></returns>
-            public static SDK_REPLY Download(out List<Operation> OperationsList)
-            {
-                SDK_REPLY currError = SDK_REPLY.NO_ERROR;
-                OperationsList = new List<Operation>();
-
-                return currError;
-            }
-
-            /// <summary>
-            /// Get operation full details
-            /// </summary>
-            /// <param name="OperationId"></param>
-            /// <param name="SingleOperation"></param>
-            /// <returns></returns>
-            public static SDK_REPLY GetSingle(string OperationId, out Operation SingleOperation)
-            {
-                SDK_REPLY currError = SDK_REPLY.NO_ERROR;
-                SingleOperation = new Operation();
-
-                return currError;
-            }
-
-            /// <summary>
-            /// Update single operation
-            /// </summary>
-            /// <param name="OperationId"></param>
-            /// <param name="progressPercent"></param>
-            /// <param name="dueUntilDays"></param>
-            /// <param name="userId"></param>
-            /// <returns></returns>
-            public static SDK_REPLY Update(string OperationId, int progressPercent, int dueUntilDays, string userId)
-            {
-                SDK_REPLY currError = SDK_REPLY.NO_ERROR;
-
-                return currError;
-            }
-
-            /// <summary>
-            /// Upload list of operations
-            /// </summary>
-            /// <param name="OperationsList"></param>
-            /// <returns></returns>
-            public static SDK_REPLY Upload(List<Operation> OperationsList)
-            {
-                SDK_REPLY currError = SDK_REPLY.NO_ERROR;
-
-                return currError;
-            }
-
-            /// <summary>
-            /// Get list of activities for specific operation
-            /// </summary>
-            /// <param name="OperationId"></param>
-            /// <param name="ActivitiesList"></param>
-            /// <returns></returns>
-            public SDK_REPLY GetActivities(string OperationId, out List<Activity> ActivitiesList)
-            {
-                SDK_REPLY currError = SDK_REPLY.NO_ERROR;
-                ActivitiesList = new List<Activity>();
-
-                return currError;
-            }
-
-            #endregion Public Methods
         }
 
         #endregion Public Classes